他现在是偶尔来看看我。He comes to see me once in a while ,

It is once in a while that he comes to see me ,

昨天就是在这条街上发生了汽车事故。The car accident happened in this street yesterday ,

It was in this street that the car accident happened yesterday ,

他们轮流来照看生病的母亲。They took care of their sick mother by turns ,

It was by turns that they took care of their sick mother ,

是为了赶早班车，他才起得很早的。He got up early to catch the early bus ,

It was to catch the early bus that he got up early ,

正是由于水涨了，他们没有渡过河去。They could not cross the river because the water had risen ,

It was because the water had risen that they could not cross the river ,

在强调结构 it is 或者was   that 中，要用 because 来引导原因状语从句，不用 since 或 as 。

裁缝是按我自己的尺寸做了一套衣服。The tailor made a suit to my own measure ,

It was to my own measure that the tailor made a suit ,

“ with或者 without +名词代词+其他成分”这种结构，也可以放在 it is 或者 was   that 中，成为被强调的部分。

他是手里拿着一把伞在门口等待着他的儿子。He was waiting for his son at the gate with an umbrella in his hand ,

 It was with an umbrella in his hand that he was waiting for his son at the gate ,

是有老师站在她旁边，她才感到很紧张的。She felt very nervous with the teacher standing beside her,

It was with the teacher standing beside her that she felt very nervous ,

有时强调句在形式上和定语从句、状语从句很相似。我们除了从意思上进行区分外，还能根据强调句结构特点来进行判断，如能去掉 it is 或者was    that 后，句子仍然通顺，就是强调句。

是在火车站我们16年前第一次相逢。（强调句，强调地点状语 at the railway station ）It was at the railway station that we first met sixteen years ago ,

这是我们16年前第一次相逢的火车站。（定语从句， where 是关系副词，在定语从句中做地点状语）It was the railway station where we first met sixteen years ago ,

前几天发生汽车事故的就是在这条街上。（强调句，强调地点状语 in this street ）It was in this street that the car accident happened the other day ,

这是前几天汽车事故的那条街。（定语从句， where 是关系副词在定语从句中做地点状语）It was this street where the car accident happened the other day ,

他昨天是半夜到家的。（强调句，强调时间状语 at midnight ）It was at midnight that he got home yesterday ,

昨天他到家时已是半夜。（ when 引导的是时间状语从句， it 是代词，指时间）It was midnight when he got home yesterday ,

强调句的一般疑问句基本句型是： Is或者Was + it + that +句子其他成分？

他见你的地方是在办公室吗？Did he see you in the office just now?

Was it in the office that he saw you just now?,

 他经常去的地方是图书馆吗？Does he often go to the library?

Is it to the library that he often goes?,

强调句的特殊疑问句的基本句型是：特殊疑问词+ is或者was + it + that +句子其他成分

你究竟什么时候第一次去长城的？When did you first go to the Great Wall?

When was it that you first went to the Great Wall?,

 你昨晚去哪儿了？Where did you go last night?,

 究竟是谁告诉你这件事的？Who was it that told you about it?,

你究竟为什么在会上保持缄默？Why did you keep silent at the meeting?

Why was it that you kept silent at the meeting?,

一般疑问句基本句型是：情态动词或助动词+ it + be +被强调的部分+ that +句子其他成分？

 他是在家被杀的吗？Could he be killed at home?,

他被杀的地方会是在家里吗？Could it be at home that he was killed?,

也许她把钥匙丢在办公室了？Might she leave her keys in the office?,

也许她把钥匙丢在办公室了？Might it be in the office that she left her keys?,

特殊疑问句基本句型是：特殊疑问词+情态动词或助动词+ it + be + that +主语+句子其他成分

可能是在什么地方发生这个事故的？Where might the accident happen?

Where might it be that the accident happened?,

现在还在办公室里的会是谁呢？Who can it be in the office now?

Who can it be that is in the office now?,

用“ what 从句+ be +被强调成分”或“被强调成分+ be + what 从句”表示强调。除了 what 外，人们很少使用其他连词。在这种强调结构中，不用where或者when或者why，应用the place where或者the time when或者the reason why。

约翰想要好好休息一下。John wants a good rest ,

约翰想要的是好好休息一下。What John wants is a good rest ,

好好休息一下正是约翰想要的事。（比较少见）a good rest is what John wants ,

我要你们做38页上的练习二。I'd like you to work on Exercise Two on Page thirty-eight,

我要你们做的作业是38页上的练习二。What I'd like you to work on is Exercise Two on Page thirty-eight,

我要两本书。I need two books ,

我要的是两本书。（注意谓语动词的数）What I need are two books ,

你们踢足球的地方是操场，而不是教室。The place where you should play football is the playground not the classroom ,

我是在清晨朗读英语。The time I read English aloud is early morning ,

她缺课的原因是她身体不好。 The reason why she was absent from class was that she was feeling unwell ,