warn 的用法及固定搭配

warn

1.下面两句意思相同：

• I have warned him not to see her again.
• I have warned him against seeing her again.

2.warn后面可以接以that引导的从句。例如：He warned that the bridge was unsafe.

3.warn的宾语后面可以接以that引导的从句。例如：Did he warn you that he might be late?