I hear that he has come back yesterday.这句子对吗,不对该怎么改呢

I hear that he has come back yesterday.这句子对吗,不对该怎么改呢 I hear that John has come back to china,_____? A.isn't he B. Can I borrow your color pencil,please?这句话对吗?如果不对该怎么改呢? I hear that he swam in the sea yesterday?这句话对吗?swam可以换成swim, 这句话对吗?不对该怎么改 I love places where are warm.这个句子对吗?不对该怎么改 I'm sure that he will come back tomorrow中的that he will come改 这句话对吗?如果不对应该怎么改呢?谢谢 请问这几话对吗?不对怎么改呢? He may be in the classroom,isn't he 这句子对吗?不对怎么改,改成must be 请问it seems that he has come back 同义句 he ____ _____ come back He has h_____ that Miss White will come back