as if

as if — conjunction

1. used to say that a situation, person, or thing seems to be a particular way base

1.conjunctionB1
Definition

used to say that a situation, person, or thing seems to be a particular way based on how they look or behave, even though you are not completely certain

Example

Dahlia looked as if she had stayed up all night working on her project.

as if + past perfect — unreal past situation

The garden looked as if a storm had torn through it the previous evening.

as if + past perfect — describing visible aftermath

Synonyms
  • as though

    identical meaning and grammar; slightly more formal in tone

  • like

    informal alternative, very common in everyday speech

Grammar Patterns

as if + clause

Usage Note

When the situation described after 'as if' is hypothetical or unreal, formal English uses the subjunctive 'were' instead of 'was' with singular subjects: 'He looked as if he were lost.'

Common Mistakes

She danced as if she was the only person in the room.
She danced as if she were the only person in the room.
Use 'were' (subjunctive) after 'as if' when describing a hypothetical or unreal situation.

2. used to describe a physical action or gesture that shows what someone seems to w

2.conjunctionB1
Definition

used to describe a physical action or gesture that shows what someone seems to want to do or how they appear to feel

Example

Christopher raised his hand as if to wave goodbye to the crowd.

as if + to-infinitive — expressing intention through action

Tamar paused at the door as if waiting for someone to call her back.

as if + present participle — describing manner

Synonyms
  • as though

    interchangeable in this pattern; 'as if to' is the most natural form

Grammar Patterns

as if + to-infinitive

as if + prepositional phrase

Usage Note

In this structure, the action after 'as if' is visible and describes what the person's body language suggests, not what actually happens next.

Common Mistakes

He opened the door as if to entering the room.
He opened the door as if to enter the room.
Use the bare infinitive after 'as if to', not the gerund.

3. used after verbs such as seem, feel, look, and appear simply to mean 'that' — st

3.conjunctionB1
Definition

used after verbs such as seem, feel, look, and appear simply to mean 'that' — stating an observation or belief rather than comparing it to a hypothetical situation

Example

It feels as if the winter will never end this year.

It feels as if + clause — expressing a personal sense

Erik sounded as if he had already made up his mind about the decision.

linking verb (sounded) + as if + clause

Synonyms
  • as though

    interchangeable, equally natural after linking verbs

  • like

    common in informal spoken English, less acceptable in formal writing

Grammar Patterns

linking verb + as if + clause (='that' + clause)

Usage Note

Unlike sense 1 (APPEARS TO BE), this use does not compare the situation to a hypothetical scenario. 'It seems as if the meeting has started' simply states an observation, equivalent to 'It seems that the meeting has started.' In informal conversation, 'like' often replaces 'as if' in this pattern ('It looks like it will rain'). In more formal writing, 'as if' or 'as though' is preferred.

Common Mistakes

It seems as if.' (incomplete)
It seems as if the meeting has already started.
'as if' must introduce a full clause, not stand alone.

Synonym discussion

Sense: conjunction/1

All three convey that something appears to be true, but they differ in register and formality. 'As if' is the standard neutral choice in both writing and speech. 'As though' is interchangeable in meaning and grammar but carries a slightly more literary tone — it fits well in formal essays and narrative prose. 'Like' is the most informal option; it is very common in everyday conversation ('It looks like it'll rain') but many style guides advise against using it in formal writing to introduce a clause. For example, in a school report, 'She acted as if nothing had happened' is appropriate, while in casual conversation a friend might say 'She acted like nothing happened.' Choosing the right one depends on the context and the level of formality you want to convey.

as if ↗as thoughlike ↗

Etymology

Old EnglishMiddle EnglishEnglish

'As if' has been used in English since the 1300s. It combines 'as' (meaning 'in the same way, like') with 'if' (expressing a condition). The original sense was a direct comparison: something happens in the same way it would if a certain condition were true. Over time, it developed into a fixed phrase used not only for real comparisons but also for describing appearances, intentions, and hypothetical situations.

First known use

13th century

13th century, in the meaning defined at sense 1