Substitution: One/Ones, Do & So

C1 · AdvancedAdvanced Grammar

I'll take the red one, not the green one. I think so.

What you'll learn

Unlike ellipsis, which omits a repeated word entirely, substitution replaces it with a short word
'One' (singular) / 'ones' (plural) replace a repeated countable noun
'Do'/'does'/'did' (and sometimes 'do so') replace a repeated verb phrase
'So' replaces a whole repeated clause after verbs like think, believe, hope, expect; 'not' replaces a negative one

Substitution vs. ellipsis

Substitution is closely related to ellipsis, but instead of dropping a repeated word completely, it replaces it with a short placeholder word — 'one', 'do', or 'so' — to avoid repetition while still sounding complete.

"I'll take the red one, not the green one. (one = apple)"

'One' and 'ones' for nouns

'One' replaces a singular countable noun already mentioned; 'ones' replaces a plural one. They often follow an adjective that distinguishes which one is meant.

"This jacket or that one?"

"These shoes are nicer than the old ones."

'Do' for verb phrases

'Do/does/did' can replace a whole verb phrase already mentioned, especially in comparisons and short agreement responses like 'so does she' / 'so did I'.

"I recycle, and my neighbor does too."

"She passed the exam, and so did I."

'So' and 'not' for whole clauses

After verbs like think, believe, hope, expect, guess, and suppose, 'so' can replace an entire repeated clause — and 'not' replaces it in the negative, instead of repeating the whole clause.

""Is it raining?" "I believe so.""

""Will she come?" "I hope not.""

Real English

"The black one or the silver one?"

"He works hard, and so does she."

"I'm afraid not."

"I didn't finish the report, but she did."

Watch out

✗I'll take the blue.

✓I'll take the blue one.

An adjective alone can't stand in for the noun in English — add 'one' (or 'ones' for plural) after it.

✗My neighbor does it too.

✓My neighbor does too.

For a short agreement response like this, 'does' alone substitutes for the whole verb phrase — adding 'it' is unnecessary.

✗I'm afraid it not.

✓I'm afraid not.

The negative substitute is just 'not' on its own, right after the verb — not 'it not'.

Real life — Choosing at a shop

"Which bag do you want — the big one or the small one?"

"The small one, I think. Do you have it in blue?"

"I believe so — let me check."

"Great, thanks."

Practice

Exercise 1 · Choose the correct substitution

Choose the correct substitution for: 'I'll have the red apple, not the green apple.'

Exercise 2 · Choose the correct plural substitution

Choose the correct plural substitution for: 'These shoes are nicer than those shoes.'

Exercise 3 · Choose the correct substitution

Choose the correct substitution for: 'I recycle, and my neighbor recycles too.'

Exercise 4 · Choose the correct substitution

Choose the correct substitution for: 'He said he'd call, and he called.'

Exercise 5 · Choose the correct response

Choose the correct response: 'Is it raining?' 'I believe it is raining.'

Exercise 6 · Choose the correct negative response

Choose the correct negative response: 'Will she come?' 'I hope she will not come.'

Exercise 7 · Choose the correct substitution

Choose the correct substitution for: 'You should clean the kitchen the way I cleaned the kitchen.'

Exercise 8 · Choose the correct substitution

Choose the correct substitution for: 'The long jacket or the short jacket?'

Exercise 9 · Substitute the repeated noun

Substitute the repeated noun: 'I don't like this design, I prefer the other design.' → I don't like this design, I prefer the other ___.

Exercise 10 · Substitute the whole clause

Substitute the whole clause after 'think': 'Is the shop open?' 'I think the shop is open.' → I think ___.

Exercise 11 · Sort into groups

I'll take the blue one.

I'll take the blue.

He works hard, and so does she.

He works hard, and so she does.

0 / 4 sorted

Quick challenge

Five quick questions to check what stuck.

Question 1 / 5

Score: 0/0

Choose the correct substitution for: 'Which pen is yours? The black pen or the silver pen?'

You learned

Substitution replaces a repeated word with a short placeholder, unlike ellipsis.
'One'/'ones' replace a repeated countable noun.
'Do'/'does'/'did' replace a repeated verb phrase.
'So'/'not' replace a whole repeated clause after think/believe/hope-type verbs.

AdvancedAdvanced Grammar

Ellipsis

Learn how English omits words that are already understood from context — after auxiliaries, in comparisons, and in short conversational replies.

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Nominalisation

Learn how to turn verbs and adjectives into nouns for a more formal, academic register — and the prepositions that follow them.

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Emphasis Structures

Learn emphatic 'do', reflexive pronouns for emphasis, and intensifiers like 'such' and 'so' that stress a point without changing its meaning.

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Fronting

Learn how to move an object, complement, or location to the front of a sentence for emphasis and cohesion — and when that triggers inversion.