1) Many nations have been faced with the problem of ...
2) Recently the problem has been brought into focus.
3) Recently the phenomenon has become a heated topic.
4) Recently the issue has aroused great concern among ...
5) Nowadays there is a growing concern over ...
6) Never in our history has the idea that ... been so popular.
7) Faced with ..., quite a few people argue that ...
8) According to a recent survey, ...
9) With the rapid development of ..., ...
不用进行时的动词
现在完成时
allow什么情况下不能用于被动式
过去完成时
现在进行时代替将来时
英语主动表被动用法归纳
“be said+不定式”的七种结构
“be+过去分词”与“get+过去分词”的区别
时态一致
比较过去时与现在完成时
不用于被动语态的情形
何时使用被动语态
被动语态的主要用法
get+过去分词表被动
一般将来时
8种常用时态的被动语态
将来完成时
一般现在时的用法
一般现在时代替将来时
be to和be going to
比较since和for
be going to / will
现在进行时表将来有哪些特点
英语不用被动语态几种的情形
用一般过去时代替完成时
主动语态变为被动语态的方法
过去进行时与一般过去时的区别
一般现在时表将来
一般现在时代替过去时
延续动词与瞬间动词
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