Q: Does "seat" have the same meaning in the following two sentences?

He dusted off the seat before sitting down.

There are two hundred seats in this classroom.

A: the same meaning

Q: Does "beat" have the same meaning in the following two sentences?

The boat beat in the strong wind.

Beat the subway fare.

A: different meanings

Q: Does "be" have the same meaning in the following two sentences?

I shall be writing to you soon.

The sky is blue.

A:
the same meaning