i的過去式和過去分詞是什么

　　例句

　　1.I don't know the name of the place.

　　我不知道那個地方的名字。

　　2.Gifford was a friend. I'd known him for nine years.

　　吉福德是我的一位朋友。我和他認識9年了。

　　3.We know of the incident but have no further details.

　　我們聽說過這件事，但對詳情不是很清楚。

　　4.Hire someone with experience, someone who knows about real estate.

　　雇傭有經驗、了解房地產業的人。

　　5.It helps to know French and Creole if you want to understand some of the lyrics.

　　如果你想讀懂一些抒情詩，學點法語和克里奧爾語是有幫助的。