we mustn't talk to a driver when he ___(drive)
问题描述:
we mustn't talk to a driver when he ___(drive)
答
is driving 当某件事情正在发生的时候我们不能做什么事情。这里是当司机正在开车的时候我们不要跟他讲话。
答
we mustn't talk to a driver when he is driving.
当司机正在开车时,我们不能和他交谈。
答
drives
主将从现,条件句.