Question

Q.3Complete the following sentences so that the subject agrees with the verb.
1. Twenty years____a long time to spend in prison. 

a) is

b) am

c) are​

Answer 1

Answer:(a) ' is 'is the answer

Explanation: because here twenty years is treating as singular.

Answer 2

Answer:-

Twenty years____a long time to spend in prison. 

Twenty years is a long time to spend in prison. 

why?

in the sentence 'Twenty years____a long time to spend in prison.' we have 3 options:-

a) is

b) am

c) are

lets try to make a sentence with each one of these

Twenty years is a long time to spend in prison. 

Twenty years am a long time to spend in prison. 

Twenty years are a long time to spend in prison. 

in the sentences above,

Twenty years is a long time to spend in prison makes sense.

even though twenty years is plural, if we add 'are' the subject does not agree with the verb. but by adding 'is' the subject agrees with the word.

so we take the term as singular, and add 'is'

hope it helps you!