英语语法when we arrived,we found him____.a.was dying b.dead c.di

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英语语法
when we arrived,we found him____.a.was dying b.dead c.died d.die
为什么不能选a.不是found sb doing吗?
yesterday l saw a boy ____by a car
a knocking down b,knock down c.to knock down d.knocked down
能不能告诉我see的用法,这里为什么用被动
when ______on,the washing machine still doesn't work .a turn b.to turn c.turning d.turnedif you want this paper ____immediately,you'd better ask ms li for help.
a to type b.typing c.be typed d.typed d 不是被动吗,为什么不能选c
还有一些开头是用ing形式还是用ed形式怎么选择呢?

1.found sb.doing sth.是发现某人正在做某事.而dead 是一种状态,意思是,当我们赶到的时候,他已经死了,处于一种状态当中.
2.see 后面加doing sth.是看到某人正在做某事,而see sb do sth.是看到某人做了某事,这里的意思是,昨天我看到一个小男孩被一辆汽车撞倒了.有一个标志性词by,表被动.
3.看整体意思,机器只能是被操作,所以用被动语态.一般来说,ing表示主动,ed表示被动

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