C2 · Proficiency

Ellipsis & Substitution

The grammar of leaving things out — how proficient speakers avoid repetition by omitting recoverable words or replacing them with compact pro-forms like so, do, and one.

Level: C2 Cohesion and economy Play · Practice · Score

The Grammar Transformer

Choose a device. A context.

Five devices, three contexts — 15 hand-built sentences. Watch repetition disappear: words drop out entirely, or shrink into so, do, and one.

“Are we late?” — “I don’t think so.”

Structure:think / hope / suppose / be afraid + so / not

‘So’ substitutes the whole clause ‘that we are late’. With think-verbs, the negation moves to the verb: ‘I don’t think so’, not ‘I think not’.

Got the pattern? Jump to the practice →

The rules — with examples

Three substitutes, two kinds of ellipsis, and the little words that must survive the cut.

The three substitutes

Clause → so / not

think / hope / be afraid + so / not

“Is it canceled?” — “I’m afraid so.”
“Will it hurt?” — “I hope not.”

Verb phrase → do

do (+ so / it / that)

She works harder than I do.
He promised to tidy up, and he did so.

Noun → one / ones

one / ones for countable nouns

I’ll take the blue one.
Nicer than the ones we had.

Never “I think yes.” A clause is substituted with so: “I think so.” With think, believe, suppose, imagine, negation moves to the verb (“I don’t think so”); hope, guess, be afraid take not directly (“I hope not”).

The two kinds of ellipsis

Keep the auxiliary — drop the predicate

I haven’t finished, but she has. “Can you help?” — “Yes, I can.”

Rule: the first auxiliary stays behind as the recoverable anchor

Keep the to — drop the verb

I didn’t go, though I wanted to. Join us if you’d like to.

After: want, hope, try, would love, would like, plan, mean

Gapping — parallel clauses share one verb

Tom ordered tea, and Sue, coffee. John plays guitar; Paul, drums.

Rule: works only when the clauses are genuinely parallel — the comma marks the missing verb

Repetitive vs. natural — side by side

Repetitive — grammatical but robotic

“Will they win?” — “I think that they will win.”

Nothing is wrong, but no fluent speaker repeats a whole clause the listener just said.

Natural — substitute and stop

“Will they win?” — “I think so.”

‘So’ carries the whole clause. This economy is what makes C2 English sound effortless.

Agreement inverts: “I love jazz.” — “So do I.” “I’ve never tried sushi.” — “Neither have I.” The pattern is So / Neither + auxiliary + subject — never “So I do” or “Neither I have”.

Conversation chunks — learn them whole

hopeful no

I hope not

“Will it hurt?” — I hope not.

reluctant yes

I’m afraid so

“Is it canceled?” — I’m afraid so.

hedged yes

I suppose so

“Can he come?” — I suppose so.

soft no

I don’t think so

“Are we late?” — I don’t think so.

positive echo

So do I

“I love jazz.” — So do I.

negative echo

Neither can I

“I can’t swim.” — Neither can I.

polite decline

I’d love to, but…

“Join us?” — I’d love to, but I can’t.

conditional link

If so / If not

If so, call me; if not, wait.

do so needs an action verb. “He promised to apologize, and he did so” works; “I know the answer and she does so too” does not — know is a state. Say “and so does she” or “and she does too”.

The recoverability rules

What must survive the cut

keep the first auxiliarykeep the ‘to’so = positive clausenot = negative clauseone / ones = countables onlydo so = action verbs onlySo / Neither + aux + subjectgapping needs parallel clauses

The test: can the listener rebuild the missing words instantly? If yes, cut or substitute. If a needed anchor disappears too (“I’d love” instead of “I’d love to”), the sentence collapses.

Practice & score yourself

Ten questions — five multiple choice, five gap-fill. Instant scoring and a short explanation for every answer.

Your score

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Answer a question to begin.

The one rule to remember

If a word is already clear from context, don’t repeat it — omit it (ellipsis) or replace it with a pro-form (so, do, one). Just keep whatever the grammar needs to stay recoverable: the first auxiliary, or the little word to.

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