來源:網(wǎng)絡(luò)資源 2022-05-24 14:42:18
英語if引導(dǎo)的英語知識(shí)點(diǎn)
(1)if引導(dǎo)賓語從句和狀語從句的區(qū)別
if引導(dǎo)賓語從句時(shí)意為“是否”,從句中該用什么時(shí)態(tài)就應(yīng)用什么時(shí)態(tài)。
if引導(dǎo)條件狀語從句時(shí)意為“假如”,從句中應(yīng)用一般現(xiàn)在時(shí)代替一般將來時(shí)。
e.g.She wanted to know if you were a teacher.
I don’t know if the letter is yours.
They’ll go boating if it is fine tomorrow.
I’ll give it to her if she comes next week.
(2)if引導(dǎo)賓語從句時(shí)多數(shù)情況下可以與whether互換,但如果要突出“究竟是……還是不……”這層意思時(shí),通常用whether,并在后面的加上“or not”,即一般要選擇whether構(gòu)成whether…or not的結(jié)構(gòu)。
e.g.Please find out whether the money is his or not.
Let me know whether you can come or not.
I want to know whether you can help me or not.
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