Lead过去式和过去分词是什么

　　We lead the way in space technology.

　　我们在航天技术方面处于领先地位。

　　If we take the lead in this, others may follow.

　　如果我们在这方面带头行动，其余的.人就会跟着来。

　　I tried to lead the discussion back to the main issue.

　　我试图把讨论引回到主要问题上。

　　She has tried to lead a good life.

　　她努力规规矩矩地生活。

　　He should be able to lead a perfectly normal life.

　　他应该能够过上完全正常的生活。