八年級下冊英語總復(fù)習(xí)資料(廣州牛津版英語)
3) 當(dāng)從句是客觀真理時,從句永遠(yuǎn)用一般現(xiàn)在時
eg: my mother told me that ice turns into water if you heat it.
用whether而不用if 表示“是否”,引導(dǎo)賓語從句的情況
當(dāng)賓語從句中出現(xiàn)“or not”時
eg: i don’t know whether or not i should ask him about it.