lead的过去式和过去分词

　　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。

　　Social and political problems led to the outbreak of war.

　　社会和政治问题导致了战争的爆发。

　　Eating too much sugar can lead to health problems.

　　食用过多的糖会引起健康问题。