Question

Since2011,they________(visit)their son every year.

Answer 1

The answer is 'have been visiting.'

Since 2011, they have been visiting their son every year.

• In the given sentence, we need to fill in the blanks with the correct form of the verb 'visit.'

• A time period has been mentioned since which the action is being carried out till the present. Thus, it takes the present perfect continuous tense.

• The form of present perfect continuous tense is 'has/have+ been+ verb-ing.'

Answer 2

Since 2011, they have been visiting their son every year.

Explanation:

• The word "since" shows that the action mentioned has started in the past and continues till the present.
• This is an example of the present perfect continuous tense. We use the following format in the present perfect continuous tense- have/has+ been+ verb+ing.
• Therefore, as the given question has used the word "since" we should know that it is a present perfect continuous tense, and "have been" should be used before the verb and "+ing" should be added to the verb.