① cannot原先只用于英式英語中,美式英語則分開寫成can not,現(xiàn)在cannot則通用了。
You cannot leave now. It's raining hard outside. 你現(xiàn)在不能離開,外面正下大雨。
② can't為省略式,一般只用于口語中。
You can finish the work tomorrow,can't you?你明天能完成這項工作,對嗎?
I can't go with you,Mary. 瑪麗,我不能同你一起去。
③ can not分開寫可以表示強調。
It is not a parking lot. You certainly can not park here. 這不是停車場,你絕不能在這里停車。