fly的过去式和过去分词分别是什么

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

他小时候曾经以为，只要有足够决心，想要飞就能飞起来。

How time flies! I've got to go now.

时间过得真快！现在我得走了。

It remains to be seen whether his project will fly.

他的计划能否成功尚需拭目以待。

Is this the first time that you've flown?

这是你第一次乘飞机吗？

The plane was flying in cloud most of the way.

飞机一路大多在云层里飞行。