Question: "bed" used in the same way in the following two sentences?

The track bed had washed away.

Sea bed, river bed, lake bed.
Answer: different meanings
Question: "be" used in the same way in the following two sentences?

I may be an hour.

"Where is my umbrella?" "The toolshed is in the back."
Answer: different meanings
Question: "do" used in the same way in the following two sentences?

All you ever do is surf the Internet.

A 'B' grade doesn't suffice to get me into medical school.
Answer: different meanings
Question: "opening" used in the same way in the following two sentences?

The opening received good critical reviews.

The opening established the basic theme.
Answer:
different meanings