Subject-verb agreement

Nobody (knows, know) the trouble I've seen.

• knows

• know

One of my sisters (is, are) going on a trip to France.

• is

• are

Either my mother or my father (is, are) coming to the meeting.

• is

• are

Annie and her brothers (is, are) at school.

• is

• are

Every one of those books (is, are) fiction.

• is

• are

The box of oranges (is-are) on the porch.

• is

• are

The army (is-are) conducting maneuvers in March.

• is

• are

There (was-were) several dents in the car.

• was

• were

Everybody (was-were) asked to be quiet.

• was

• were

The value of cars and motorcycles (has-have) increased.

• has

• have