系动词用法点拨：
1．系动词的进行时态应分情况讨论。
一般地说，状态系动词无进行时态，而动态系动词有进行时态。
但是在某些情况下，状态系动词也有进行时态，表示两个用途：
一是表示一种短暂的、反常的状态。如：
He is being kind.（一时而不能持久的性质）他装出和蔼可亲的样子。
二是表示一种探询口气，使语言客气、生动、亲切。例如：
I hope you are keeping well.（语气委婉）我希望你保持健康。
Are you feeling any better?（语气亲切）你感觉好了些吗？
试比较：
Your hand feels cold.（无意识的静态性质。）你的手摸起来冰凉。
不可以说：
Your hand is feeling cold.(×)
但可以说：
The doctor is feeling her pulse.（有意识的动态动作）医生正在给她拿脉。
The soup tastes good.（静态性质，无进行时）这汤的味道不错。
The cook is tasting the soup.（动态动作，有进行时）厨师在尝汤的味道。

总之，系动词有无进行时态应随系动词的意义或其语境变化而变化。
我们在概述某一动词的进行时态时，不能笼统地说feel，smell无进行时，应指出其意义及其语用环境。
例如smell的用法可见一斑。
①smell作“嗅觉”的能力时，虽是实义动词，但指的是一种性质的存在状态不能用于进行时态，常与can, could, be able to连用。
The camels can smell the water a mile off.骆驼能嗅出一英里外有水。
②指“嗅、闻”的动作时，实义动词，可用于进行时态。
The girl is smelling the flower.这姑娘正在闻那朵花。
③smell指“含有……气味”，“发出……气味”等事物性质时，半系动词，无进行时态。
The dinner smells good.这饭菜闻起来真香。

2．系动词的时态与形容词的比较级连用的问题。
某些含有变化意义的动态系动词如get, become, grow, turn等的进行时态可与形容词的比较级连用，表示渐进过程，其意思是“越来越……”。例如：
He is growing taller and taller.他长得越来越高了。
Our life is getting better and better.我们的生活是越来越好了。
The things are getting worse.情况是越来越糟了。

3．所有半系动词的被动语态要分情况讨论。
英语中某动词在作系动词用时，无被动语态，而作实义动词用时，才有被动语态，二者不可混为一谈。例如：
不能说：
The apple is tasted good.
（因为taste此时是系动词，“尝起来”之意，指的是苹果的性质，无被动语态）
但我们可以说：
The apple is tasted by me.这苹果被我尝了一下。
（taste此时指“尝一尝”这一动作，有被动语态）
因此，在平时的英语教学和学习之 ，要有意注意半系动词在具体的语言环境中到底是系动词用法还是实义动词用法，要注意区分、识别。

4．瞬间动态系动词能否与时间段连用的问题
英语中某些表示瞬间意义的系动词不能与“for+时间段，since+时间点，how long until+时间,by + 时间，so far”等直接连用。例如：
①不能说：He has become a teacher for 2 years.
应改为：He has been a teacher for 2 years.
②不能说：He has turned writer since 3 years ago.
应改为：He has been a writer since 3 years ago.
或It is three years since he turned writer.
③不能说：He got angry until his child came back home.
应改为：He didn’t get angry until his child came back home.

5．系动词能接几种表语（从句）
系动词除了接adj.\n.\prep.短语，某些adv.以外，还可接以下几种表语形式：
①能接as if/as though表语从句的系动词有：look（看起来），smell（闻起来），sound（听起来），feel（觉得）；appear（显得），seem（似乎）。例如：
It looks as if we are going to have snow.看样子天要下雪了。
He looked as if he had just stepped out of my book of fairy tales.
他看来好像刚从我的童话故事中走出来似的。
She seemed as if (though) she couldn’t understand why Laura was there.
看来她好像不能理解为什么劳拉呆在那儿。
It sounds to me as though there’s a tap running somewhere.
我好像听到某处水龙头流水的声音。
She felt as if her head were splitting.
她仿佛觉得她的头要裂开了。
The river appeared as if enveloped in smog.
那条河好像笼罩在烟雾之中。
It seems as if it were spring already.
好像已是春天了。
②可用于“It+系动词+that从句”结构的有：seem, appear, 不可用be, look。如：
It seemed that he had made some serious mistakes in his work.
好像他在工作中犯了严重错误。
It appeared that he was talking to himself.
好像他在自言自语。
③能用不定式作表语的系动词有：be, seem, get, look, appear, prove, grow.
Her job is to look after the children.
她的工作是照料孩子们。
He seems not to look after the children.
他好像不是她的父亲。
She looks to be a young girl of twenty year-old.
她看起来像是一个20岁的年轻姑娘。
He didn’t appear to dislike it.