Level: elementary

Some verbs are followed by either a noun or an adjective:

She was a good friend.
She was very happy.
V + N
V + Adj
He became headmaster.
He became angry.
V + N
V + Adj

These verbs are called link verbs. Common verbs like this are:

be
become
appear
feel
look
remain
seem
sound

He looked hungry.
He looked a good player.

She seemed an intelligent woman.
She seemed intelligent.

After appear and seem we often use to be

She appeared to be an intelligent woman.
He seemed to be angry.

Some link verbs are followed by an adjective but not a noun. Common verbs like this are:

get go grow taste smell

He got hungry in the evening.
The dog went crazy.
She grew stronger every day.
The soup tasted wonderful.
This milk smells bad.

Link verbs 1

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Link verbs 2

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