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risk是可数名词。risk，名词、及物动词，作名词时意为“风险；危险；冒险”。作及物动词时意为“冒…的危险”。例句：Should you risk it all?你真的该全然的冒险吗?
1. 用作动词时，为及物动词，表示“冒……的危险”“使遭受危险”。如：
They risk their lives in order that we may live more safely. 他们冒了生死危险使我们生活得更安全。
后接动词作宾语时，要用动名词，不能用不定式。如：
They risked losing everything. 他们冒失去一切的危险。
A lot of people run the risk of being killed. 许多人冒着被杀害的危险。
2. 用作名词时，注意以下用法：
(1) 要表示冒危险，通常与动词run, take等搭配。如：
Why run the risk? 为什么要冒这种危险?
There was so much to lose (that) we couldn’t take any risks. 损失这么多，我们不能冒任何风险了。
(2) 表示“……的危险”，其后通常不接不定式，而接 of doing sth。如：
He dare not run [take] the risk of being caught by the police. 他不敢冒被警察抓住的危险。
There’s not much risk of losing money if you bet on that horse. 如果你押那匹马，输钱的风险不太大。
比较run [take] the risk of doing sth与run [take] a risk in doing sth：前者指冒做某事的危险或风险，其中的of doing sth为修饰the risk的定语；后者指做某事有危险或冒风险，其中的in doing sth是状语，in有类似when的含义。如：
I took a risk in telling him the news at that moment. 我那时把消息告诉他，那是冒了风险的。