knock off和 knock over 有什么不同?麻烦给个例句,简单点的它们的意思相同吗?用法呢?麻烦给个例句谢谢

off有掉的意思，knock off是打掉……，over有翻的意思，knock over是打翻…… The little girl knocked off the glass by accident.
小女孩不小心碰落了玻璃杯。
They knocked off five dollars from the price.
他们把价格降低了五美元。
Let's knock off now.
咱们现在歇一会儿吧。
I want to knock over the table and hit him.我想推翻桌子,去打他

当knock off和knock over同时在表示“撞倒”意思的时候,knock over一般就是指撞倒（+ed被动）,比如说A boy was knocked over by a passing car but was fortunately unhurt.而knock off则指从某个地方（被）撞倒,如A boy was knocked off his bike by a passing car but was fortunately unhurt.knock off:
knock off
打翻;撞倒
撞倒;打掉
The little girl knocked the glass off by accident.小女孩不小心碰落了玻璃杯.
减去
They knocked off five dollars from the price.他们把价格降低了五美元.
停止;歇工
Let's knock off now.咱们现在歇一会儿吧.
knock over
打翻;撞倒
He knocked a glass over.他把玻璃杯打翻了.
使惊奇
She was knocked over by the news.她被那消息惊呆了.
消除
We have knocked over every difficulty.我们已排除种种困
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