1、如：I guarantee to pay off his debts. 我保证还清他的债务。
guarantee sb. sth =guarantee sth to sb. 向某人保证某事
2、如：The boss guaranteed his workers the full salary.老板向员工保证工资会全部发放。
guarantee sth.+adj. 保证某物如何
3、如：The art dealer guaranteed the picture genuine.那个画商保证这幅画是真的
guarantee that+句子
4、如：I guarantee that she will come 我保证她会来。
