表示已经知道的原因时用as或since,即某种原因在说话人看来已经很明显,或已为听话人所熟悉,因此它是句中不很重要的部分。since要比as正式一些,它们通常被置于语句之前,但有时却相反。
Seeing all of the children already seated, he said,Since everyone is here, lets start。
下列情况下只能使用because:
①在回答why的问句时;
②在用于强调句型时;
③被not所否定时。
4、地点状语从句:where, wherever
Make a mark wherever you have any questions。
We will go where the Party directs us。
5、目的状语从句:that, so that, in order that
注意:目的状语从句的谓语动词常与情态动词连用,否则可能是结果状语从句。不可置于句首。
6、结果状语从句:that, so that, so that, such that
注意:so + 形容词/副词 + that从句;such + 名词 + that从句。
7、方式状语从句:as, as if
Ill do as I am told to。
It looks as if it is going to rain。
8、比较状语从句:than, as
9、条件状语从句:if, unless, so long as, in case, once, a far as, on condition that。
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