if
/ɪf/
连词
假如，如果
I'll pay you double if you get the work finished by Friday.
如果你周五前完工，我付你双倍的报酬。
（用于引出从句，常为间接引语）是否
I don't care if he likes it or not - I'm coming!
我不在乎他乐不乐意，我反正要来！
（用于礼貌地作出请求或评论）
If you'd like to take a seat, Mr Chang will be with you in a moment.
您请先坐一会儿吧，张先生一会儿就过来。