在本组句子中,每句都含有whether she will agree with me. 它在句1中作了句子的主语,是主语从句。在句2中作了wonder的宾语,是宾语从句。在句3中作了is的表语,是表语从句。在句4中作了idea的同位语,是同位语从句。
1. whether 表示是否的含义,它引导的名词从句具有一般疑问句的特点。作主语时,我们也可用it作形式主语,代替whether从句。例如:It doesnt matter too much whether she will agree with me.
2. if 也有是否的含义,它可以引导宾语从句。例如:I wonder if the conclusion is true.但不能引导主语从句。例如,我们不可以说:If the conclusion is true hasnt been proved.
但若用it作形式主语,则后面可以接if 引导的主语从句,例如:It hasnt been proved if (whether) the conclusion is true. 此外,if 一般不能引导表语从句和同位语从句。
最后,需要补充的是:
1. because也可以引导表语从句,例如: It is just because the public dont know the truth. 这仅仅因为公众不知道事情的真相。
2. as if (as though)也引导表语从句,此类表语从句常跟在seem, appear, look, taste, sound, feel等词之后。
It looks as if it is going to rain.看来要下雨了。
It sounds as though you are from the south of the United States . 听起来你好像来自美国南部。
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