语法图解
探究发现
①Over time I have been changed quite a lot.
②Since the 1970s many new applications have been found for me.
③The important problem has been discussed for nearly two weeks.
④The ink has not been removed from the clothes.
⑤Haven't your problem been solved?
⑥How many buildings have been built in your school?
[我的发现]
(1)以上例句中都使用了现在完成时的被动语态。
(2)以上例句中第①②③句是该时态的肯定句式；第④句是否定句式；第⑤句是一般疑问句式；第⑥句是特殊疑问句式。
