我在《英语语法新思维》中做错了几道习题，但书中只有答案没有讲解，还请老师们帮忙分析一下。

1. This kind of solar cooker can be used only in the day time _______ the sun is shining.

A when   B as   C while   D since

该选哪个？其他选项为什么不能选？

答案选A，定语从句缺（时间）状语

中文意思：这种太阳能电饭锅仅仅是在白天太阳照射的时候使用。

2. This is the shop ______ I often buy foodstuff.

空白处为什么不是which ,而是to which?

答案选in which=where 定语从句缺（地点）状语

中文意思：这是我经常购买食物的商店。

3. The second reason ______ he gave the teacher for his being late for school soun

A.why B.when C.which D.that

选D为啥不选A啊?

答案选 D，关系代词用that 因为先行词有序数词修饰。

中文翻译 ：他 给老师第2个上学迟到的理由。

4. Those guilty of a serious crime ______ refuse to reform must be severely punished.

A which  B whom  C when  D who

还请帮忙分析一下该句结构。

答案选D先行词为指人的不定代词，需要用关系代词 WHO引导定语从句。

中文翻译:那些犯了严重罪且拒绝改造的人必须严厉惩罚。

5. Yet no firm evidence had come to light ______ the men arrested were actually responsible.

A which  B as  C what  D that

还请帮忙分析一下该句结构。

答案选D，that引导同位从句(然而，没有确凿的证据 表明所逮捕的人确实要负责任。）

6. "Do you like the book your father gave you?" "Very much, it's exactly _____ I wanted."

A one which  B that  C one what  D. the one

答案选D，缺先行词"the one " 关系代词作宾语，可以省略

谢谢老师抽空回答，但是我对第一和第二道题还是有些疑问。

(1)This kind of solar cooker can be used only in the day time _______ the sun is

shining.

这道题是怎样判定是定语从句而不是其他从句比如状语从句？

继续解答：

定语从句是作后置定语修饰前面的“先行词”即名词/代词

状语从句是作状语的，用来修饰主句的“谓语动词”

因此，根据以上，显然，是用来修饰前面名词 day time 白天时间.

(2)This is the shop ______ I often buy foodstuff.

=This is the shop where I often buy foodstuff

=This is the shop in which I often buy foodstuff.

这就是我经常在里面购买食物的商店。

定语从句缺状语，就使用关系副词where,when,why

定语从句缺，主语，宾语，定语，表语，就用关系代词"that/which/who/whom/whose"