- Correct. Even though links the two sentences and creates an adverbial of concession.
- Incorrect. There are two independent clauses here that are not linked in any way. The comma is not enough to indicate a relationship - there is information missing. Even if you read the two as seperate sentences, it has stopped making sense (if he was so careful, why was his knee sore?).
- The sentence starts with although..., creating the adverbial (subordinate) clause of concession. The comma separates from the ordinary clause that it relates to: his knee was really sore after the performance.
- Very careful had been the dancer has incorrect word order; the dancer is the subject and it should go before the verbs had been and adjective very careful. It also misses a link between the two sentences, so this is incorrect in many ways.
Clause
- I missed the bus. — ✅ independent clause (stands alone)
- Because I overslept. — ❌ fragment (dependent clause, can't stand alone)
- Because I overslept, I missed the bus. — ✅ dependent + independent = complete sentence
- I missed the bus, and I was late. — ✅ two independent clauses joined by and
A clause is a unit built around a verb with a subject. Independent = can stand alone. Dependent = needs an independent clause to complete it.
Test: does the group of words have a subject + verb AND can it be a sentence on its own? Yes → independent clause. Has a subject + verb but feels incomplete → dependent clause.
Adverb
- ✅ She sings beautifully — ❌ She sings beautiful
- ✅ He drives carefully — ❌ He drives careful
- ✅ They arrived late — ✅ a late train (same form, both roles)
- ✅ She works hard — ❌ She works hardly (different meaning!)
The -ly words are adverbs — they modify verbs, adjectives, or other adverbs, telling you how, when, where, or to what degree.
Pattern: most adjectives become adverbs by adding -ly, but watch the exceptions — fast, hard, late, well — that keep the same shape or change meaning entirely.
Dependent clause
- ❌ Because I was tired. — fragment (dependent clause standing alone)
- ✅ I left early because I was tired. — attached to independent clause
- ✅ The man who called is my uncle. — relative clause (modifies man)
- ✅ If you're ready, let's go. — conditional dependent clause
A dependent clause has a subject + verb but cannot be a complete sentence. It starts with a subordinating word (because, if, when, although, who, which) and must attach to an independent clause.
Test: does the clause start with a subordinator and feel incomplete on its own? → dependent clause. On its own, it's a fragment — attach it to a main clause.
Complex sentence
- ✅ Because I overslept, I missed the bus. — dependent clause (reason) + independent
- ✅ The man who called is my uncle. — relative clause inside the sentence
- ✅ If it rains, we'll stay inside. — conditional dependent + independent
- ❌ Because I overslept. — fragment (dependent clause alone)
A complex sentence pairs an independent clause with one or more dependent clauses linked by subordinating conjunctions (because, although, if, when) or relative pronouns (who, which, that).
Pattern: independent clause = the main point. Dependent clause = the background, reason, or condition. Move the dependent clause around for emphasis.
C1 | Advanced
- ✅ Not only did she finish early, but she also helped others. — inversion for emphasis
- ✅ It is the process that matters, not the result. — cleft sentence
- ✅ I insist that he be present. — formal subjunctive
- ✅ Were I to disagree, I would say so. — inverted conditional
These are C1 structures — the CEFR advanced level. At C1 you control inversion, cleft sentences, subjunctive forms, and register-switching fluently across formal and informal contexts.
Marker: if you can restructure a sentence for rhetorical effect without hesitation, you're C1.
Hard
- Had she not intervened, the situation would have escalated. — inverted conditional
- All distractors are grammatically plausible in other contexts
- Multiple rules interact (e.g., tense + aspect + modality)
- Context determines the answer — no single "rule" is enough
Hard marks upper-intermediate to advanced challenges: B2+, interacting rules, edge cases, plausible distractors, and contexts where pattern-matching fails.
Use "Hard" when Easy/Medium feel trivial and you want to test whether you actually understand a rule versus just recognising surface patterns.