If you get up early,you won't be late for class.同义句(unless)you get up early ,you ( will)be late for class为什么呢unless=if not如果你不早起 你就会迟到 注意 下列4句 意思一样If you get up early,you won't be late for classunless you get up early ,you will be late for classIf you don't get up early,you will be late for classunless you don't get up early,you won't be late for class