下面是四位英语教师的英语教学片段：

Teacher A

T: What day is today?

S: Is Monday.

T: Oh, goo

D. It is Monday?

S: Yes, it is Monday.

Teacher B

T: Who's this woman?

S: He is ...

T: Oh, not he. You should use she.

Teacher C

T: What did you do yesterday?

S: I do my homework at home.

T: Oh, great! What about you, Lin Tao?

Teacher D

T: All of you will be a teacher today. Please check the homework of your deskmates. When you find the mistakes, circle and correct them please.

Ss: OK.

（1）请分析A、B、C三位教师对待学生语言错误的方式及其利弊。(9分)
（2）教师D采用了什么纠错方法?请简要说明。(5分)
（3）教师在对待学生语言错误上应注意哪些关键点?(16分)