My brother wants to come back next year. So do I (both...and) this is Grammar conjunctions I don’t know how to put these two conjunctions in this sentence without making it wrong. Please help me.
Both my brother and I wants to come back next year is your answer.
Both... is the beginning of the sentence, and since there are two of you (your brother and you), you need a "and" inbetween you two. The rest are the same.
