you can write the verb phrase in each sentence. underline the helping verbs and once the main verbs twice

Don Quixote had read the tales.
Could he ignore warnings?
He did consider himself brave.

Don Quixote had read the tales.

- helping verbs: had
- main verb: read

Could he ignore warnings?
- helping verbs: Could
- main verb: ignore

He did consider himself brave.
- helping verbs: did
- main verb: consider