Question

Which verb agrees in number with its subject?

The bark of sequoias ..................... sometimes two feet thick.

A. Are
B. Were
C. Is
D. Have been

Answer 1

a

Answer 2

Ask the question : "what is sometimes two feet thick".
The answer decides whether the verb should be singular or plural.
For example,
One tree out of a thousand ______(be) infested.
So what is infested? One tree or a thousand trees?
Is the answer "is", or "are"?

The context of the sentence says it's one tree is infested, so the answer is

\(One tree\) out of a thousand __is___infested.

Answer 3

*\(one~ tree\)

Answer 4

Ok @mathmate thanks

Answer 5

you're welcome! :)
Next time, please post in the English section, and then tag people from there!