请英语高手找出下列句子的错误,并在横线上改正.
问题描述：
请英语高手找出下列句子的错误,并在横线上改正.
1.I is form America.( ) ________________
A B C
2.Good afternoon,mr Black.( ) ________________
A B C
3.Who that man ( ) _______________________
A B C
答
1.I is form America.( is ) _________am_______
A B C
2.Good afternoon,mr Black.( mr Balck.) ______Mr.Balck__________
A B C
3.Who that man ( A ) ___________is____________
A B C