Answer:
dream
Step-by-step explanation:
The verb dream is the third person plural of the Present Simple, in which the verb form does not take the suffix -s. In fact, the subject pronouns I, you, we and they take the infinitive form of the verb in Present Simple affirmative sentences, without any inflection.
On the other hand, the subject pronouns she, she and it take the third person singular suffix -s in affrmative sentences in the Present Simple. This form does not include apostrophes; for example:
Andy dreams nearly every night.