fall from: 从…落下;从...落下;没能保持...的水平;从...滚落下来
例句:This sentence fell from that textbook.
这话是从那本教科书中摘录下来的.
fall over: 跌倒;向前摔倒;落在;摔倒
例句:Mrs Jenkins missed her footing and fell over.
詹金斯夫人一脚踩空,跌倒在地.
knock off: 撞倒;撞落;停工;击倒
例句:She accidentally knocked the glass off.
她不小心把玻璃杯碰掉了.
knock over: 撞翻;撞倒;打翻;把某人撞倒
例句:The cat knocked over the vase on the table.
猫将桌上的花瓶弄翻了.