备战职称英语考试：重点语法解析(8)

　　Make a mark wherever you have any questions.

　　We will go where the Party directs us.

　　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.

　　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.

　　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.

　　比较状语从句:than, as

　　条件状语从句:if, unless, so long as, in case, once, a far as, on condition that.

　　注意if与unless的区别:不能用and连接两个unless从句,即不能有 unless ,and unless .

　　但if not and if not却不受此限.

　　You wont lose your weight unless you eat less and unless you exercise more.

　　但可以说 unless you eat less and exercise more.

　　注意状语从句中从句的省略现象

　　连接词 + 过去分词

　　Dont speak until spoken to.

　　Pressure can be incrased when needed.

　　Unless repaired, the washing machine is no use.

　　连词 + 现在分词

　　Look out while crossing the street.

　　连词 + 形容词/其他

　　常见的有it necessary、if possible、when necessary、if any等.