prevent
1.prevent作“阻止成功”解，假使阻止而不成功不可用prevent。如She prevented him from going是“她阻止他去而他真的不去了”。而“她阻止他去，可是他还是去了”该说She tried to prevent him from going, but he still went。
2.下面两句意思相同：
- She prevented him from going.
- She prevented his going.
- She prevented him going也有人说，但不算正当。注意不可说She prevented him to go。
