may be done是什么时态

　　What may be done at any time will be done at no time.

　　随时可做之事，恰是没时间所做之事。

　　The permissions spell out what may be done with a work.

　　权限详细地说明了一个作品可以用来做什么。

　　It is wonderful how much may be done if we are always doing.

　　如果我们总是做事，有多少事能被做是奇妙的。