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as

conj. · prep. · adv.
  1. 1 comparison (conj.)
    A1 Beginner

    used to compare two things that are the same in some way.

    used to indicate equality in degree or manner between two entities or actions.

    Example

    The second movie was just as good as the first one.

    Example

    The results of the second trial were as conclusive as the initial findings had suggested they would be.

    Usage

    Used in the 'as + adjective + as' construction.
    Pitfall
    He is as tall than his brother.
    He is as tall as his brother.

    In comparisons of equality, use 'as... as', not 'as... than'.

  2. 2 because (conj.)
    B1 Intermediate Formal

    used to give a reason for something.

    used to introduce a clause that provides a reason or explanation; synonymous with 'since' or 'because'.

    Example

    As it was raining, we decided to stay home and watch a movie.

    Example

    As the chairman was unable to attend the meeting, the vice-chair presided over the vote.

    Usage

    Often used at the beginning of a sentence in formal writing.
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  1. 3 while (conj.)
    A2 Elementary

    used to show that two things are happening at the same time.

    used to indicate that one action or event is occurring simultaneously with another.

    Example

    She waved to her friends as she walked onto the bus.

    Example

    The audience began to cheer as the lead singer stepped into the spotlight.
  2. 4 role or job (prep.)
    A1 Beginner

    used to describe the job or purpose of someone or something.

    used to indicate the capacity, role, or function of a person or object.

    Example

    She works as a nurse in the local hospital.

    Example

    He was hired as a consultant to oversee the restructuring of the marketing department.

    Usage

    Followed by a noun phrase.
    • functioning as
    Pitfall
    He works like a teacher.
    He works as a teacher.

    Use 'as' to describe a real job or role; use 'like' for a comparison to something that is not actually true.

  3. 5 intensifier (adv.)
    C1 Advanced Informal Dialect

    used after an adjective to mean 'very' or 'extremely'.

    used as a post-positive intensifier for adjectives.

    Example

    The weather today is hot as.

    Example

    After working a double shift, he was tired as and went straight to bed.

    Teacher's tip

    This usage is specific to Australian and New Zealand English; learners should be aware of its regional nature.
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