1.  Some people suppose that student's grade will drop down if they have a love.

2.  So their grade drop from "A" to "B".

3.  Every time my grades drop a lot, she often does homework with me and answers the questions I ask.

4.  However, his class teacher told me that his grades dropped sharply recently and didn't know what happened to my son.

5.  You can certainly imagine how surprised I was when finding that his grade dropped sharply.