Well, I have to bite the bullet. After all, it is impossible to give special counseling to those transferred students.

Generally speaking, it is appropriate to slow down the progress and then insert some previous grammar points in the usual lectures.

If the textbook is sbs, let the whole class recite the grammar points of the previous words.

Then take a test in the last class.

Of course, this is for those transfer students who simply fall behind because they didn't attend the last class.

As for those that are not pleasant to hear, no matter how you teach them, just ignore them.