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一道英语题 The bus was so crowed that I couldn't fine a seat____

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一道英语题 The bus was so crowed that I couldn't fine a seat____
答案是to sit on 我想问,是什么时候要在句末加on等介词啊,详细一点,再举几个例子,太感谢你了! 明天就要考试了(15号) 今晚之前要回答谢谢!
sit是不及物动词,必须在后面加介词,然后才能加宾语形成完整的语句.这句话是宾语前置,SEAT前置了.调换一下语序,正常语序是I sit on a seat.所以不能省略on.然后是例子对吧?
i need a paper to write on.
i should find a pencil to write with.
do you need a chair to sit in?