have加過去式是什么時態(tài)

　　Now she won't have to go out to work any more.

　　現(xiàn)在她不必再出去工作了。

　　There have been many changes in recent years.

　　近幾年發(fā)生了許多變化。

　　Call me if you have any problems regarding your work.

　　你如果還有什么工作方面的問題就給我打電話。

　　No new SARS cases have been reported in the region.

　　該區(qū)沒有新增非典型肺炎病例。

　　You will always have the bad as well as the good in the world.

　　人生在世總是有苦有甜。