1.狀語從句

　　狀語從句有很多種，讓步狀語從句是個難點。讓步狀語從句主要由以下一些詞或詞組引導(dǎo)：though, although, even if, even though, whether…or…, no matter wh-(或how), whatever(whoever, whichever等)。

　　1)Young _____ he is, he knows what is a right thing to do.

　　A. that B. as

　　C. although D. however

　　正確答案是B。as也可以引導(dǎo)讓步狀語從句，但通常把被強(qiáng)調(diào)的形容詞或副詞等放在句首。

　　2)_____，you must show your ticket to go into the cinema.

　　A. No matter whomever you are B. In whomever you are

　　C. Whoever you are D. No matter who are you

　　四個選擇項中，A中的Whomever多了ever，B項中in whomever部分格式不對，D項的語序不對，只有C是正確的。

　　2.定語從句

　　定語從句又分限制性和非限制性定語從句�？忌�要特別注意非限制定語從句的用法。從形式上看，限制性定語從句由who ,whom ,whose ,which ,that 等關(guān)系代詞或when ,why, where等關(guān)系副詞引導(dǎo)，不用逗號把主句和從句分開。而非限制性定語從句中不會出現(xiàn)that，而且要用逗號把主句和從句分開。

　　1)The United States is composed of fifty states, two of _____ are separated from the others by land or water.

　　A. them B. that

　　C. which D. those

　　正確答案為C。在非限制性定語從句中，關(guān)系代詞前面可能會有介詞，在介詞前面還可能有其它限定詞，這就更復(fù)雜一些，需特別注意。

　　2)An old friend from abroad, _____ I was expecting to stay with，telephoned me from the airport .

　　A. that B. whom

　　C. who D. Which

　　這是一個非限制性定語從句，正確答案是B，因為此處的whom 是stay with 的邏輯賓語。

　　3.主語從句

　　主語從句在主從復(fù)合句中充當(dāng)主語，可以引導(dǎo)主語從句的詞有what, that以及who, why, where, when等連接代詞或連接副詞。為避免頭重腳輕，特別是在口語中，通常設(shè)it為形式主語，與下邊這些結(jié)構(gòu)連用。

　　It is a pity that …It is an honor that …

　　It is a shame that …It is a good thing that …

　　It is a fact that …It is a surprise that …

　　以及

　　It is strange that …It is surprising that …

　　It is true that … It is fortunate that …

　　It is necessary that … It is possible(impossible)that …

　　1)_____ I saw was two men crossing the street.

　　A. What B. Whom

　　C. Who D. That

　　答案為A。

　　2)It is desirable that he _____.

　　A.gives up trying B. give up trying

　　C. would give up trying D. is going to give up trying

　　答案B。本句也是一種虛擬語氣句。