是因为有介词from.prevent/stop sb from doing sth句型是的意思是“阻止/防止某人做某事”.介词在句子中不能独立存在,一定要有介词宾语或者逻辑上的宾语.而动词作介词宾语时只能用动名词形式.因为介词宾语都是由名词性的东西来充当,如：动名词、名词、代词（宾格）、名词性从句中的宾语从句（通常由一些wh-的词引导）.虽然动词不定也是名词性的,但是不能作介词宾语,只有这个是例外.是否为名词性可根据它可不可以在句子中作主语或宾语来判断,如：To see is to believe.（眼见为实）I want to go there.在这两句中,to see作主语,to go作want的宾语,所以不定式为名词性.其它句子成分也可用这种方法来判断.
关于这句英语的动词不定式the journey is so smooth that there is nothing t
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