注意以下几点:
ⅰ.区别if当作是否,还是如果
eg. I don't know if he ______ (come)if it ______(rain) tomorrow.
ⅱ.用whether不用if的几种情况
1)后接不定式
eg. I can't decide whether to go to Beijing.
2)与or / or not连用
eg. I want to know whether you will go to the park or not.
3)在句首时
eg. Whether this is true or not, I can't say.
4)whether还可以引导让步状语从句,意为不管,无论
eg. Whether it rains or not, we are going to the park tomorrow.
2.语序:宾从用陈述句语序
eg. 1)I don't (A) know whether (B) will he (C) come (D) tomorrow. _____________
2)He asks (A) me when (B) will you (C) come back (D). _____________
3)Could you tell (A) how many players (B) are there (C) in (D) a football team? ________
3.时态
主句 宾语从句
一般现在时 一切时态
一般过去时 过去范畴的某一时态(一般过去时;过去进行时;过去完成时;过去将来时)
但当宾语从句是指客观事实、普遍真理、自然现象时,则只能用一般现在时。
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