first的过去式是什么意思

　　I didn't like the job much at first.

　　起初我并不很喜欢这个工作。

　　The first stage in research is data collection.

　　研究工作的第一步是收集资料。

　　Our first task will be to set up a communications system.

　　我们的首项任务是架设通信系统。

　　You go first, I'll take my lead from you.

　　你领头，我来照样做。

　　I think we should go back to first principles.

　　我认为我们应该回到基本原则上。