d.表示两个动作是同一动作
He who
helps others is helping himself.
帮人就是帮自己。
If you
insist on doing it, you are doing a foolish thing.
如果你坚持做这件事，你就是在干傻事。
e.be动词的进行时态
be动词一般不用于进行时态。但有时可用“am, is, are + being +形容词”结构表示暂时或故意如此。
The boy
is being naughty.这孩子有点儿淘气。
I don't
think you are being fair.
我认为你不公平。
He is
being modest.
他现在很谦虚。
比较：
You are
not polite.
你不讲礼貌。（一贯如此）
You are
not being polite.
你可有点儿不礼貌了。（暂时的现象）
3．不用进行时态的动词
①表示状态的动词
这类动词有seem,
look, appear, have, belong to, own, hold等。
This
backpack belongs to me.
这背包是我的。
He seems
rather angry with you.
看起来他很生你的气。
②表示知道、信念、理解、推测、怀疑、希望等含义的动词
这类动词有know,
remember, understand, see, think, believe, suppose, hope, doubt等。
I don't
think he will come tomorrow.
我想他明天不会来。
I still
remember the days when we studied together.
我还记得我们一起学习的那些日子。
提示：
有时这些动词的进行时态可表示心理状态的缓慢发展过程。
She's
understanding you better now.
她越来越了解你了。
③表示要求、心愿等意义的动词
这类动词有want,
wish, need, desire等。
Your
clothes need washing.
你的衣服需要洗了。
How I
wish I were a bird！
我多希望我是一只鸟啊！
④表示继续或持续含义的动词
这类动词有continue,
keep, last, go on等。
She
still continues in poor health.
她仍然身体很差。
Every
day after finishing his homework, he goes on to do some reading.
他每天做完作业后，都会继续看会儿书。
⑤表示感觉的动词
这类动词有see,
hear, smell, taste, feel等。
The
apples taste good.
这些苹果尝起来不错。
This
flower smells nice.
这花闻上去很香。
Your
suggestion sounds reasonable.
你的建议听上去有道理。
注意：
如果这些动词表示一种有意识的行为，则可用进行时态。
She is
tasting the apple.
她正在尝苹果。
The dog
is smelling the footprints.
狗正在嗅脚印。
The bell
is sounding for dinner.
晚饭铃响了。
4．现在进行时和一般现在时的比较
①暂时性动作和经常性动作
The
computer is working perfectly.
计算机运转得很好。（暂时）
The
computer works perfectly.
计算机运转很好。（一直如此）
②持续性动作和短暂性动作
The bus
is stopping.
车停了下来。（渐渐地）
The bus
stops.车停了。（迅速）
③暂时性动作和永久性动作
She is living
in the country.
她现在住在农村。（暂时）
She
lives in the country.
她住在农村。（永久）
④有感情色彩和没有感情色彩
He is
doing well at school.
他在学校表现很好。（赞扬）
He does
well at school.
他在学校表现很好。（一般事实）
B.过去进行时
1.过去进行时的构成
过去进行时是由“was / were +现在分词”构成的。
I was
doing my homework at this time yesterday.
昨天的这个时候我正在做作业。
Were you
expecting him yesterday?
你昨天一直在等他吗？
They
were not talking when I came in.
我进来的时候他们没在说话。
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