句子“We took off at dawn”.的“take”为什么用这种形式?

句子“We took off at dawn”.的“take”为什么用这种形式? We'll set off at dawn if it___raining by then. He takes off his riancoat.这句中的take off的take为什么是用复数? After several delays we ( )took off at six o'clock.A.in end 英语句子时态问题.the plane will take off at 9:00the plane takes off up off 等等这种词的短语,越多越好,make up,take up,xxx up,take off,xxx off 选用take away 或take off 完成下列句子（注意形式变化）急! I have to see you one more time before you took off 这里的take 下面的英语句子为什么要用这个词的这种形式?(括号里的) took it off的意思 took off的过去式是什么 we sometimens take off our shoes的翻译