at first
prep. phr..prep. phr.. This phrase means 'in the beginning'. You often use it to contrast the start of something with what happened later.
prep. phr.. An adverbial phrase indicating the initial stage of a process or period, often used to introduce a contrast with a subsequent state or event.
At first, the work seems difficult.
At first I didn't like the city, but now I love living here.
The theory, which at first appeared revolutionary, was later disproven by a series of simple experiments.
This phrase often introduces a contrast, and is frequently followed by a clause beginning with 'but'.
Contrast 'at first' (initial state, implies change) with 'first' or 'firstly' (listing points in order) to prevent confusion in sequential narration.
At first, open the book. Second, read page one.First, open the book. Second, read page one.Use 'first' for listing steps; 'at first' describes an initial state that is expected to change.