risk
1.risk前面用at。例如：You must do it at your own risk. 和You do it at the risk of being punished.
2.risk（名词）后面有时接以that引导的从句。例如：There seemed to be no risk that the train would run off the rails that night.
3.risk（动词）后面接动名词，不接不定式，如I cannot risk leaving her alone里的leaving不可改作to leave。这句可能有两个不同的意思：“我不能冒任她独自留着的险（我必须设法避免任她独自留着）。”或“我不能贸然任她独自留着（我决不故意任她独自留着）。”I cannot risk losing my best friend和He cannot risk breaking his leg当然都只可能有一个意思。
