动词:谓语动词有且只有一个。如果再出现动词只能以非谓语形式存在:-ing, -ed, to do
To get a high score, we have to study hard.
I came in, followed by two dogs.
Seeing is believing.
口诀: 谓语非谓经常混 谓语句中就一个
其余动词非谓语 非谓形式有三种
-ing, -ed 和to do 现在分词表主动
过去分词表被动 目的要用不定式
主宾要用动名词
一、谓语动词常考点:时态、语态、情态、倒装、主谓一致
二、谓语动词的时态:
时间:过去、现在、将来、过将
状态:一般、进行、完成、完成进行
三、四级考试中主要考的三个时态:过去完成时、将来完成时、完成进行时
1、过去完成时:到过去某个点为止所完成的动作;在过去发生了两个动作,先过去完成时后一般过去时。
过去完成时与一般过去时常常成对出现。
We _________ our breakfast when an old man came to the door.
A) just have had B) have just had C) just had D) had just had
Before the first non-stop flight made in 1949, it _________ necessary for all planes to land for refueling.
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