Both the words LIKE and AS are used in similar ways, but there are some differences in their meanings:
He works AS a waiter. - means he is actually a waiter.
He walks LIKE a duck. means he resembles a duck.
The work LIKE can means AS THOUGH in some situations.
It looks LIKE they won.
It looks AS THOUGH they won.
The words appear to be and seem like mean the same thing, which mean give the impression of something:
It SEEMS AS IF we are late.
We APPEAR TO BE late.
He behaves like the President of the company.
THOUGH
He acts (1) the President of the company.
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