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Help the mad scientist document the results of his anti-gravity potion by choosing the correct word for each gap.

"The potion didn't _________________________ the gravity in the laboratory as I had hoped. Instead, the only noticeable _________________________ was that my poor assistant began to float toward the ceiling. I must study how this formula will _________________________ my future funding, because the side _________________________ of these experiments are getting terribly expensive!"

The correct answers are affect, effect, affect, and effects.

Affect is almost always a verb meaning "to influence or produce a change in" (e.g., didn't affect the gravity, will affect my funding).

Effect is almost always a noun meaning "the result or outcome of a change" (e.g., noticeable effect, side effects).

Hint: If you can put "the," "an," or an adjective (like "side") in front of it, you usually need the noun effect.

Medium B2 | Upper Intermediate Noun Verb

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Noun

The cat sat on the mat. — concrete nouns (things you can touch)
Happiness is important. — abstract noun (idea/quality)
London is beautiful. — proper noun (specific name, capitalised)
I need some information. — uncountable noun (no a/an, no plural)

A noun names a person, place, thing, idea, or quality. Nouns determine article choice, verb agreement, and pronoun reference. Types: common/proper, concrete/abstract, countable/uncountable.

Test: can you put the or a before it? Can you make it plural? If yes to either → it's functioning as a noun.

Verb

walk → walk / walks / walked / walked / walking (5 forms, regular)
go → go / goes / went / gone / going (5 forms, irregular)
be → am/is/are/was/were/be/being/been (8 forms)
can → can / could (modal: only 2 forms, no -s, no -ing)

A verb is the one word class every English sentence requires. Carries tense (when), aspect (duration), mood (attitude), and voice (active/passive). Regular verbs add -ed; ~200 irregular verbs have unpredictable past forms.

Key insight: fix your verbs and most grammar problems disappear. Wrong tense, wrong agreement, wrong form — verb errors account for the majority of grammatical mistakes.

B2 | Upper Intermediate

✅ If I had studied harder, I would have passed. — third conditional
✅ The report is being reviewed by the committee. — passive progressive
✅ Having finished the exam, she left. — participle clause
✅ He denied having taken the money. — complex verb pattern

These are B2 patterns — the CEFR upper-intermediate level. At B2 you handle mixed conditionals, all passive forms, participle clauses, and can argue a point clearly. This is the level most universities and employers require.

Marker: if you can write a structured essay and debate an abstract topic, you're B2.

Medium

If I were you, I would apologise. — one rule (second conditional), but distractors like was tempt you
Answers require active thought, not instant pattern recognition
Vocabulary and context are realistic, not artificially simplified
Usually tests one rule, but the wrong answers are plausible

Medium marks middle-difficulty challenges: A2–B1, one rule tested, but with realistic distractors that require genuine understanding.

Use "Medium" when Easy feels too obvious but Hard feels overwhelming. This is where most productive learning happens — the sweet spot of difficulty.