初中英语易混淆短语比较学习.docVIP

相似词辨析：can与be able to的区别 ?can 与 be able to 均可表示某人做某事的能力，常可互换。例如： ? Im not able to [cant] explain this. 我不能解释这个问题。 He was able to [could] speak French very well. 他的法语讲得很不错。 区别： (1) 从时态形式来看，can 只有现在式和过去式(could)两种，而 be able to 则可根据需要使用多种时态，还可以和一些情态动词连用，或用作动词不定式等非谓语形式。I havent been able to sleep recently. 最近我睡不着觉。 Our baby will be able to walk in a few weeks. 我们的宝宝再过几个星期就能走路了。 You might be able to persuade him. 你也许能够说服他。 I hope to be able to do the work. 我希望能干得了这项工作。I regret not being able to help her. 我很遗憾未能帮助她。 ?? (2) 用于现在时，can 泛指一般的能力，而 be able to 则主要指具体做某件事的能力。He can swim. 他会游泳。 ??? I am able to express my idea in a clear way. 我能清楚地表达自己的想法。 ?(3) 在表示过去的一般能力时，两者没有很大差别。I could / was able to play the piano when I was young. 我年轻时会弹钢琴。 ?但如果要表示一时的能力，即在过去某时有某种能力，并顺利地完成某事，则要用 was / were able to，而不能用 could。例如： ? Though he was sick, he was able to swim across the river. 虽然他病了，但他还是游过了河。 ? After five hours of climbing, we were able to reach the top of the mountain. 经过5个小时的攀爬，我们终于登上了山顶。could 表示可能或有能力做，was [were] able to 则表示能够做且确已做到。比较下面两句： I was able to pass the examination. 我通过了考试。（不仅有能力，而且实际上做到了。相当于I succeeded in passing the examination.） ?I could pass the examination. 我当时有能力通过考试。（有能力，但实际上不一定做得到） 　seem的用法1. seem (vi.好象,仿佛,看来,似乎)的用法: 1) 后接形容词或to be +形容词或名词作表语.如: Things far off seem (to be) small.远处的东西看上去小些. He seems a very clever boy. 他似乎是个很聪明的男孩. 2) 后接(to sb.)that从句,但主语是it.如: It seems to me that there is something strange about the case.在我看来这件案子有点奇怪. It seems that you are lying. 看来你在撒谎吧. 3) 后接不定式(to do/ to be),主语一般是人称.如: I seemed to hear a voice in the distance. 我好象听到远处有说话声. He seems (to be) quite happy.他似乎十分快乐. 4) 后接as if / as though,主语一般是it. At that time, it seemed as if/ as though I couldnt think of a right word anyhow. 当时,我似乎怎么也想不出一个恰当的字眼来. 5) seem 的否定式. When his wifes pet cat died, Alan didnt seem to care at all.阿兰妻子的宠猫死了,他好象一点也不在乎. There doesnt seem to be much hope that hell come. 看来他来的希望不大.talk to, talk with 这二者也有区别：前者作“对……讲”解，有时指上级对下级，含有“训话”的意味；