Question

Spacecraft has or have been seen hovering over the White House over the last few weeks.

Answer 1

Spacecraft have been seen hovering over the White House over the last few weeks.

Explanation:

Has is used with singular noun.

Have is used with plural noun.

The term “have” and “has” are used with the pronouns-plural noun and singular noun respectively.

Has is used in the sentence with present tense and present perfect tense.

Have is used in the present tense when the subject is a plural noun or the pronouns.

In the given sentence, spacecraft have been seen hovering over the White House over the last few weeks.