Starting point and range
In words like 以前 and 以后, 以 marks a starting point or boundary in time.
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以has 2 distinct senses for the same pronunciation

In words like 以前 and 以后, 以 marks a starting point or boundary in time.
before
before; formerly; previously; in the past
In words like 以便 and 以致, 以 links an action to its purpose or consequence.
in order to avoid; so as not to; lest
In words like 可以 and 以为, 以 expresses ability, opinion, or sufficiency.
that level or higher
Can you help me get the book?
I thought you wouldn't come today.
There is a supermarket north of the intersection.
Explore characters by relationship
Characters from the same exam level.
Characters pronounced "yi".
Characters with radical "人".