threaten
1.threaten的宾语后面有时接以that引导的从句。例如：The landlord threatened his tenants that he would expel them unless they paid him within a week.
2.说“威胁（某人）使他做什么事”不可在threaten后面接指人的词和不定式，如不可说They threatened him to tell them everything。可以在him后面加上to force him。
3.threaten后面接不定式比接动名词普通，如He threatened to leave us比He threatened leaving us普通。
