hand sth in to sb还是hand sth to sb,好像都对?

hand sth in to sb还是hand sth to sb,好像都对?
hand sth in to sb还是hand sth to sb,好像都对?

hand sth in to sb还是hand sth to sb,好像都对?
是都对,意思不同.举个例子
I handed the book to the teacher.我把书递给老师.
I handed my homework in to the teacher.我把作业交给老师.
hand in 有上交的意思.