aswhich非限定性定語從句

1、as, which非限定性定語從句as, which非限定性定語從句 as, which非限定性定語從句由 as, which引導(dǎo)的非限定性定語從句，as和which可代整個(gè)主句， 相當(dāng)于and this 或and that。as 一般放在句首，which在句中。as we know, smoking is harmful to ones health.the sun heats the earth, which is very important to us.典型例題alice received an invitation from her boss,came as a surprise.a

2、. it b. that c. which d. he答案c.此為非限定性從句，不能用 that修飾，而用which., it和he都使后句成為句子，兩個(gè)獨(dú)立的句子不能單以逗號(hào)連接。況 且選he句意不通。the weather turned out to be very good,was more than we could expect.a. what b. which c. that d. it答案b。which可代替句子，用于非限定性定語從句，而 what 不可。that不能用于非限定性定語從句，it不為連詞，使由逗號(hào)連接的兩個(gè)句子并在一起在英語語法上行不通it rained hard

3、yesterday,prevented me from going to the park.a. that b. which c. as d. it答案b.as和which在引導(dǎo)非限制性定語從句時(shí)，這兩個(gè)關(guān)系代詞都 指主句所表達(dá)的整個(gè)意思，且在定語從句中都可以作主語和賓語。但不同之處主要有兩點(diǎn)：as引導(dǎo)的定語從句可置于句首，而 which不可。as代表前面的整個(gè)主句并在從句中作主語時(shí)，從句中的 謂語必須是系動(dòng)詞；若為行為動(dòng)詞，則從句中的關(guān)系代詞只能用which.。在本題中，prevent由于是行為動(dòng)詞，所以正確選項(xiàng)應(yīng)為b。as的用法例1. the same as; such as中的as是一種固定結(jié)構(gòu)，和 樣。i have got into the same trouble as he (has).例2. as可引導(dǎo)非限制性從句，常帶有正如。as we know, smoking is harmful to ones health.as is know, smoking is harmful to ones health.as是關(guān)系代詞。例1中的as作k