Question

the pricipal and manager come ( has , have , )
Rohan , along with his parents present In the party ( was, were , have been )
she and I good friends( are, am ,was)
the police arrested the thief ( has , have , is)
suitable form
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Answer 1

Explanation:

the principal and manager have come. ( We are talking about 2 people which is plural, so we are using have )

Rohan, along with his parents was present in the party. (was because we are talking particularly about Rohan. If we said Rohan and his parents were (talking about more than 1 person) present )

She and I are good friends. ( Again we are talking about 2 people)

the police have arrested the thief ( have because we are talking about more than 1 policeman)