upon my faith的用法和樣例：
例句
- I vouch for the quality of my products.
我擔保我的產品的質量。 - I think my letter must have miscarried.
我想我的信一定是誤投了。 - He gave his faith that he would come on time.
他答應一定準時來。 - I am sick of having to truckle to my superiors.
我得對上司惟命是從，這叫我心里實在難受。 - Singing is not really my forte, but I'll try.
唱歌實在不是我擅長的，但是我試著唱唱看。
