改被动 you may write this letter in pencil someone must take care of the children when we go outwe must pay attention to such problemswe must finish the work by six o'clock this afternoon

this letter may be written by pencil.
the children must be taken care of when we go out.
such problem must be paid atteneion by us
the work must be finished by six o'clock this afternoon by us
希望对你有用。

This letter may be written in pencil by you .
The children must be taken care of by someone when we go out .
Such problems must be paid attention to by us .
The work must be finished by us by six o'clock this afternoon .百度地图

such problems must be paid attention to by us.the work must be finished by us by six o'clock this afternoonyou may write this letter in pencil this letter may be written by you in pencil.someone must ...

1。you may write this letter in pencil
This letter may be written in pencil.
.2。someone must take care of the children when we go out .
The children must be taken care of when we go out.
3。we must pay attention to such problems
Attention must be pait to such problems.
4。we must finish the work by six o'clock this afternoon
The work must be finished by six o`clock this afternoon.