1. 作为动词， guarantee 表示“保证”，是一个及物动词；其后可以接不定式或that 从句，但是不接动名词。例如：

误：I guarantee paying off his debt.

正：I guarantee to pay off his debt.

正：I guarantee (that) I will pay off his debt.

2. 我们常说的“在保修期内”可以用under guarantee 表示，注意这个固定短语的介词搭配是under而不能用in，例如：

误：The television is less than a year old, so it is still in guarantee.

正：The television is less than a year old, so it is still under guarantee.