Subjunctive mood is represented by three main forms in contemporary English: present subjunctive, past subjunctive, past perfect subjunctive. Other forms such as present continuous subjunctive and past continuous subjunctive are used very rarely.
These subordinate clauses may be divided into 4 types according to the realness of the condition and the time.
Apart from the aforementioned, advanced students are particularly interested in the accurate usage of such verbs as should, would, could, might, wish after if and in the case when it is omitted in the mixed type conditionals.
All this is simple and clear for you, and you would easily prove it passing a test on the subject, wouldn't you?
Gary will take a taxi to the museum if Kevin doesn't pick him up in the car.
A 1st conditional sentence with will + simple infinitive in the main clause, and if + simple present in the conditional.
I will be late tomorrow if I don't set my alarm tonight.
A 1st conditional sentence (real condition) with will + simple infinitive (will be) in the main clause, and if + simple present in the conditional.
This is a 3rd conditional, it refers to an unreal condition in the past (if they had cast their nets wider). If is omitted, and had is moved to the start of the sentence, before the subject of the if-clause. If + past perfect / auxiliary modal verb + have + past participle. (would have caught)
Select correct verbs.
Should the tiger get out of the enclosure, please run as fast as you can.
Should the tiger get out of the enclosure, please run as fast as you can.
First conditional with should. If is omitted here, and should is moved to the beginning. It denotes a very unlikely future outcome. (If the tiger gets out, you must run as fast as you can.)
Should the tiger get out of the enclosure, please run as fast as you can.
Main sentence verb is a polite imperative - Please RUN! (If the tiger gets out, you will run as fast as you can.)
This is a 2nd conditional, there is a possibility of the condition becoming reality. Use would to indicate a slightly uncertain, but possible outcome. If + simple past / auxiliary modal verb (could/should/might/may/would etc.) + simple infinitive (would be)
Select correct verbs.
If you had not contacted hotel reception during your stay last week, we would not have discounted tickets to the aquarium today.
If you had not contacted hotel reception during your stay last week, we would not have discounted tickets to the aquarium today.
This is a 3 type, negative conditional indicating a positive outcome (you did contact reception). Use if + past perfect (had contacted) to indicate an unreal condition in the past.
If you had not contacted hotel reception during your stay last week, we would not have discounted tickets to the aquarium today.
In 3rd type conditional, use would have + past participle in the main clause.
The use of were in the conditional indicates that I am not a mechanic, so this is an unreal condition with were. This means that the main clause takes would + simple infinitive (would have). In informal English, the form If I was a mechanic is also acceptable.
Select correct verbs.
If Paula could go back in time, she wouldask Boris to marry her.
If Paula could go back in time, she would ask Boris to marry her.
Could is often used in sentences with unreal conditions: going back in time is impossible.
If Paula could go back in time, she would ask Boris to marry her.
would + simple infinitive is used as the outcome is completely unrealistic.
If Paula could go back in time, she would ask Boris to marry her.
The main clause in the second type conditional is formed by would + simple infinitive, in this case ask
Select correct verbs.
If you paint the building a very bright yellow, people will find it easily.
If you paint the building a bright yellow, people will find it easily.
First conditional as it has a real condition. Use If + simple present (paint)
If you paint the building a bright yellow, people will find it easily.
First conditional with a very likely outcome: use the simple future (will + simple infinitive - will find).
This is an example of the 2nd conditional where the if-clause could still happen, so we use If + simple past (had) / auxiliary modal verb (could/should/might/may) + simple infinitive (would buy)
If you would bring the flowers to the party, then I will bring the cake.
A 1st conditional sentence with if + would + verb to indicate a polite request. Use will + verb for the main clause.
An example of could in a conditional - It refers to an unreal condition (they haven't stopped working). Use could + present tense / simple past in conditional clause.
This is an example of a 2nd conditional with would: An auxiliary modal verb (could/should/might/may/would) + simple infinitive (would cut) in the main clause, If + simple past in the conditional clause.
2nd condition, created with might to indicate an unreal scenario (it is very unlikely). Were is used for all persons in this type of if-clause. In informal speech, you can use if the gate was open.
This is a 3rd conditional, referring to an unreal condition in the past. I did not bring a towel, and this is not going to change. You use if + past perfect (had brought), and would + have + past participle (would have dried) in the main clause.
Olivia might go to the zoo tomorrow if the weather is nice.
First conditional with might. Use might + simple infinitive to indicate a remote possible outcome (It is likely Olivia will decide not to go, even if the weather is nice).
Olivia might go to the zoo tomorrow if the weather is nice.
The first conditional is formed by if + simple present verb, in this case is
Although if is implied (if the sun rises), this is a zero conditional as it is always true. You use simple present in both main and conditional clause.
If we leave now, we could be there at 3 o'clock.
The outcome is very possible, so it's 1st conditional. Formed by: If + simple present / simple future (will + simple infinitive. Here could can be replaced by many auxiliary modal verbs (will/would/can/could/should/may/might) to indicate how likely it is that they'll get there by 3 o'clock. (will=very likely -- might=unlikely)
Should in an if-clause: If is omitted here, and should is moved to the beginning before the subject. It denotes an unlikely future outcome - compare the above with If the food gets cold before you are home, you can heat it up in the microwave. If + should + simple present verb / simple present in main sentence.
This is a 3rd conditional, referring to an unreal condition in the past. You use would + have + past participle (would have gone) in the main clause, and if + past perfect (he had been delayed) for the conditional.
Subjunctive mood
Subjunctive vs indicative: indicative states facts (He goes every day). Subjunctive marks unreality (I suggest he go; If I were you). The subjunctive drops the -s and insists on were — signalling "this isn't (or may not be) real." In informal speech it's disappearing, but formal/academic writing still expects it.
The subjunctive mood = hypothetical/counterfactual marker. Present subjunctive (base form after suggest/demand/insist that). Past subjunctive (were in unreal conditionals).
Diagnostic: is the clause about something unreal, demanded, or recommended (not yet true)? → subjunctive. Is it factual? → indicative.
Indicative mood
Indicative vs subjunctive vs imperative: three verb moods in English. Indicative = facts/questions (default). Subjunctive = hypotheticals/demands (If I were…, I suggest he be present). Imperative = commands (Sit down). Knowing indicative is the baseline helps you spot when English switches to something else.
The indicative mood states facts or asks questions. It's the unmarked, default mood — everything that isn't a command or a hypothetical.
Diagnostic: is the verb simply stating reality or asking about it? → indicative. Is it giving a command? → imperative. Is it expressing something contrary to fact? → subjunctive.
Conditional sentence
Second vs third conditional: second = unreal present/future (If I had money, I would buy it — but I don't have money now). Third = unreal past (If I had studied, I would have passed — but I didn't study). The most common confusion: using second when you mean third, making your timeline unclear.
A conditional sentence = if-clause + consequence clause. Five patterns (zero, 1st, 2nd, 3rd, mixed) each encode a specific time and probability.
Diagnostic: is the hypothetical about now or then? Now → second conditional. A past event that didn't happen → third conditional.
Verb tense
Tense vs aspect: tense locates the action in TIME (past/present/future). Aspect describes its SHAPE — is it completed (perfect), ongoing (progressive), or just a fact (simple)? English combines these independently: was working = past (tense) + progressive (aspect). Confusing tense with aspect is why the 12-form grid feels overwhelming.
Verb tense = 3 time references × 3 aspects = 12 forms. Tense says when; aspect says how the action unfolds relative to that time.
Diagnostic: wrong time? → tense error. Right time but wrong "shape" (e.g., I work here for ten years instead of I've worked)? → aspect error.
Modal verb
Must vs should vs might: the most confused modal trio. Must = strong obligation/near-certainty. Should = advice/expectation. Might = possibility. Getting these wrong changes the force of your statement: You must see a doctor (urgent) vs You should see a doctor (advice) vs You might need a doctor (maybe).
Modal verbs are auxiliaries that encode modality: ability (can), permission (may), necessity (must), advice (should), possibility (might), future (will).
Diagnostic: what meaning are you adding? Obligation → must/have to. Advice → should. Possibility → might/could. Ability → can. Future → will.
Auxiliary verb
Auxiliary vs main verb: a main verb carries the action (run, eat, think); an auxiliary verb carries the grammar — tense, negation, questions, aspect, voice. In She has been eating, eating is the main verb; has and been are auxiliaries.
The English auxiliaries are be, have, do (primary) and the modal verbs (can, will, must…). They always precede the main verb.
Diagnostic: can the word stand alone as the only verb in the sentence and still carry action? Yes → main verb. No → auxiliary.
C1 | Advanced
C1 vs C2: C1 means fluent and flexible use with occasional gaps in very unfamiliar domains. C2 means native-like command of idiom, irony, and register across any subject. If you can handle advanced grammar but still miss cultural nuance or very rare idioms, you're C1.
C1 is the advanced CEFR level: inversion, cleft sentences, subjunctive mood, advanced conditionals, and precise register control in professional and academic contexts.
Diagnostic: can you write persuasively in different registers and catch subtle irony? Consistently → C2. Sometimes → C1.
Hard
Hard vs Medium: Medium tests one rule with realistic distractors. Hard tests interacting rules, edge cases, or context-dependent answers where multiple options seem correct until you think deeply. If you're scoring 80%+ on Medium, try Hard to find your real gaps.
The Hard tag filters for B2+ challenges with layered difficulty: rule interactions, subtle distractors, and contexts that demand genuine grammatical reasoning.
Diagnostic: if Hard questions feel impossible, drop to Medium and master the individual rules first. Hard assumes you already know each rule — it tests whether you can apply them together.