（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.
看不出他憎恨此事。
My advice proved to be wrong.
我的建议证明是错误的。
He will grow to like this work gradually.
他会逐渐喜欢这个工作的。
④能与there连用的系动词有：be, appear, seem.
There appeared to be only one room.
那儿好像只有一个房间。
There seems(to be)no need to go.
似乎没有必要走。

6．能用两种否定形式的系动词有两个：seem, appear.
举例说明：
It doesn’t seem that we can get our money back.= It seems that we can’t get our money back.
He seems not to be her father.= He doesn’t seem to be her father.
The baby doesn’t appear to be awake.= The baby appears not to be awake.

7．后接作表语的过去分词可构成系表结构
能构成系表结构的系动词通常有两个：第一个是常见的be(is, am, was等)；第二个是get，口语中常用。
当二者作系动词用时，它们均表示一种存在状态，而不表示被动动作；当二者作助动词用时，后接作谓语的过去分词构成被动语态。
Be + P.P常可以用get + P.P.来代替，但是并不是be系动词总是可以用get来代替。Get + P.P.系表结构常用于以下两种情况：
1）表示偶然的、突发性的、意想不到的被动动作的结果或状态。
Last night I got caught in the downpour.昨夜我被雨淋了（表示意想不到）
The new car got scratched.新车给刮坏了。（表突发性）
2）表示对自身所作的事。如get dressed, get lost等。
John got injured while playing football last Saturday.约翰上周星期六踢足球时受了伤。
They got married last month.他们上个月结婚了。
另外，要注意区分系表结构与被动语态结构的用法。

考点名称：一般过去时

• 一般过去时:
  表示过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行为；过去主语所具备的能力和性格。
  基本结构：
  主语+动词过去式+其他；
  否定形式①was/were+not;②在行为动词前加didn't，同时还原行为动词；
  一般疑问句Did+主语+do+其他。

• 一般过去时句法结构：
  肯定形式
  主语+动词过去式+其他
  例句：She often came to help us in those days.
  否定形式
  ①was/were+not；②在行为动词前加didn't，同时还原行为动词
  例句：I didn't know you like coffee
  一般疑问句
  ①Did+主语+do+其他？ ②Was\Were+主语+表语?
  例句：Did I do that?
  用表格整理如下：

  肯定式	疑问式	否定式	疑问否定式
  Iworked	Did I work?	I did not work	Did I not work?
  He(She,It) worked	Did he(she,it) work?	He(she,it) did not work	Did he(she,it) notwork?
  We worked	Did we work?	We did not work	Did we not work?
  You worked	Did you work?	You did not work	Did you not work?
  They worked	Did they work?	They did not work	Did they not work?

  记忆口诀：
  一般过去时并不难，过去动作、状态记心间。
  动词要用过去式，时间状语句末站。
  否定句很简单，didn't 站在动原前，其它部分不要变。
  一般疑问句也好变，did放在句子前，主语、动原、其它部分依次站。
  特殊疑问句也简单，疑问词加一般疑问句记心间。
  最后一条请注意，动词过去式要牢记！
  
  一般过去时中动词过去式变化规则：
  

  词	构成	举例
  一般情况	词尾+ed	动词原形	过去式和过去分词
  		look talk	looked talked
  以不发音字母e结尾	词尾+d	like arrive	liked arrived
  以“辅以字母+y”结尾	变y为i，再加ed	fly study	flied studied
  以重读闭音节结尾，且末尾只有一个辅音字母	双写词尾+ed	stop plan	stopped planned

  
  结构句型:
  1．一般句子
  I watched TV last night.
  2．一般疑问句
  Did you watch TV last night？
  3．there be 句型
  There was an apple on the table last night.
  Was there an apple on the table last night

• 一般过去时注意事项：
  1.注意主句与从句中时态的一致性
  如果主句用了过去时，从句中一般也要用过去式，或者过去进行时、过去完成时等。例如：
  He believed that he was right. 他相信自己是对的。
  I didn’t know you were here. 我不知道你在这儿。
  I thought they were with you. 我以为他们和你在一起。
  
  2.在口语中， 一般过去时并不一定指真正的过去，而只是表示一种礼貌性语气。例如：
  I wondered (wonder) if you could do me a favor. 不知你可否帮我一个忙。
  I wanted (want) to ask if I could borrow your car. 我想问问可否借用你的车。
  I hoped (hope) you could (can) give me some advice. 我希望你能帮我出点主意。
  Did (Do) you want to see me? 你想见我吗？
  
  3.used to
  used to 是一个词组，表示“过去曾经是……而现在已经停止了”的动作。例如：
  I used to work fourteen hours a day. 我过去常常一天干十四个小时。(而现在不这样了)