用may be造句(请用May be 和 May have been 造句 谢谢)
may，与may，be，造句May，i，have，it，for，my，own，?我可以拿它当做我自己专有的东西吗？，Maybe，my，li......
must be done造句(用must be done 和must be doing 造句 再加个 as a result)
be，done造句The，homework，should，be，done，by，you.The，homework，should，be，done，......