fly的過去式和過去分詞分別是什么

　　As a child he had thought he could fly, if he willed it enough.

　　他小時候曾經以為，只要有足夠決心，想要飛就能飛起來。

　　How time flies! I've got to go now.

　　時間過得真快！現在我得走了。

　　It remains to be seen whether his project will fly.

　　他的計劃能否成功尚需拭目以待。

　　Is this the first time that you've flown?

　　這是你第一次乘飛機嗎？

　　The plane was flying in cloud most of the way.

　　飛機一路大多在云層里飛行。