● Forget to do 与 forget doing区别练习
区分：
Sorry,I forgot to bring the book.(对不起，我忘了带书了。)
I forgot borrowing a book from you.（我忘记曾经向你借过书这件事）
---- The light in the office is still on.
---- Oh，I forgot___.
A. turning it off forget            B. turn it off
B. to turn it off               D. having turned it off