BBC news 2010-06-04 加文本

1.The cutting tools used by the undersea robots left a jagged edge on the remnants of the pipe which will make fitting of a fully sealed containment device more difficult.

这句话的主干是：The cutting tools left a jagged edge。used by是动词不定式做后置定语，修饰tools。which will make fitting是定语从句，修饰pipe。make是使役动词，后面跟宾语和宾语补足语。

2.Mr Hayward said they hoped to have one in place by the end of the month, but he added they'd have a better idea of the likely success of the capping operation in the next day or so.

would have将来完成时

将来完成时的基本用法表示到将来某个时间为止势必会完成或预计要完成的动作，由“will [shall]+have+过去分词”构成。如：When we get

there，she’ll have gone to work. 我们到那里时她会已上班去了。On Monday he’ll have been in Britain for three years. 到星期一，他在英国就满三年了。

3.When American or British troops have been accused of killing civilians in Iraq or Afghanistan, he said, it's their countries that investigate, not an international body.

it强调句型

在英语中，我们常用It is／was… who/that结构来突出强调句子的某一成分(一般是句子中主语，宾语或状语)。在这个句型中，it没有词汇意义，只是引出被强调的成分。如果被强调的成分是表示人的词，用who或that来连接都可以。如果是其它成分，则一律用that来连接。

E.g. It is my mother who／that cooks every day.

E.g. It was yesterday that Tom passed in the maths exam．

使用本句型的几个注意事项

1)被强调成分是主语，who／that之后的谓语动词应该在人称和数上与原句中的主语保持一致。

e.g. It is I who am right．

e.g. It is he who is wrong．

e.g. It is the students who are lovely．

2)即使被强调成分是句子中的时间状语，地点状语，原因状语等，也不能用when，where, because，要用 that。

   E.g.  It was after the war was over that Einstein was able to come back to his research work again .

E.g. It was in front of the bank that the old lady was robbed．

E.g. It was because of the heavy rain that he came late．

3)如果被强调的成分有同位语，同位语也应提前。

It was from him，his chemistry teacher，that Paul learned to watch carefully in class．

4)被强调成分是作主语的代词，用主格，是作宾语的代词，用宾格

It was he that helped me yesterday. It was me that he helped yesterday.

5)被强调部分既包括人又包括物，用that不用who

lt was the things and people that they remembered that they were talking about．