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意為“如果”)。如: I don’t care if it doesn’t 。如: I wonder if [whether] he isn’t 。如: Whether he will e is still a 。如: It was not known whether [if] he would 。如: The question is whether we should go on with the 。 (3)引導(dǎo)賓語從句且放在句首時(shí)。 (4)引導(dǎo)讓步狀語從句時(shí)。 (5)與or連用分別引導(dǎo)兩個(gè)從句時(shí)。 注:or若不是引導(dǎo)兩個(gè)從句,而是連接