The watch is still under guarantee.

这只手表仍在保修期内。

Is the television still under guarantee?

这台电视机还在保修期内吗？

The watch is under guarantee.

这个手表在担保期内。

It was still under guarantee.

中的guarantee词性是什么。

Is your mobile phone under guarantee?

你的手机还在保修期内吗？