我弟弟总是乱丢东西。
He is
forever thinking of doing more for the students.
他总是想着为学生多做些事情。
b.表示某一具体动作或心理状态的发展过程
The
house is falling down.
房子正在倒下。
The
weather is changing for the better.
天气慢慢转好了。
注意:
有时表示一个动作刚刚开始。
I'm
forgetting my English.
我的英语开始忘了。
Food is
costing more.
食品贵了起来。
c.强调动作的重复
The
train is arriving late almost every day this summer.
这个夏季火车几乎天天晚点。
Someone
is knocking at the door.
有人不断地在敲门。
The boy
is jumping with joy.
那男孩高兴地跳个不停。
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。
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