2．as，since和now that语气较弱，常用来表示一些显而易见或对方知道的原因。since译为“既然，鉴于”时不可用as替换。

　　I didn't come to school yesterday because I was ill.

　　—Why are you late today?

　　—Because I didn't catch the bus.

　　As it's raining，you'd better take a taxi.

　　Since everybody is here，let's begin.

　　考点五　让步状语从句

　　引导让步状语从句的连词有：though，although，even if/ though，however，no matter how，no matter what，no matter who等。1．though，although引导让步状语从句时都不能和but连用，但可以同yet（still）连用。

　　Although he is rich，yet he is not happy.

　　2．as/though引导的让步从句时，从句要采用倒装语序。

　　Child as /though he was，he knew what was the right thing to do.

　　Try hard as he will，he never seems to do the work well.

　　Young as/though he is，he is expert in this field.

　　3．whether...or not意为“无论（是否）”。

　　Whether you believe it or not，it is true.

　　4．however＋形容词/副词＝ no matter how＋形容词/ 副词……，意为“无论多么……”。

　　No matter how cold it is，he still works outdoors.

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