Question

when to do和 when doing的区别是什么

Answer 1

when
doing
当做....事情时
如when
doing
the
exam，we
should
be
careful。实际上这里完整一点的说是这样when
（we
are）
doing
the
exam，we
should
be
careful。
而when
to
do何时做。如she
will
tell
you
when
to
do
it.

Answer 2

when
doing
当做.事情时
如
when
doing
the
exam,we
should
be
careful.实际上这里完
整一点的说是这样when
（we
are）
doing
the
exam,we
should
be
careful.
而when
to
do何时做.如she
will
tell
you
when
to
do
it.