何以

hé yǐ zì jǐ jiě shì

何以自己解释？

How are you to explain yourself?

gàn cǐ děng gòu dàng hé yǐ miàn duì guó rén

干此等勾当，何以面对国人？

Now that you've got involved in such a dirty deal, how can you face your folks?

hé yǐ yán zhī

何以言之？

How should one explain it?

jì yǐ shuō dìng hé yǐ biàn guà

既已说定，何以变卦？

It has already been settled. What makes you change your mind?

tā zuó tiān tóng yì le jīn tiān hé yǐ fǎn duì

他昨天同意了，今天何以反对？

He agreed yesterday, so why is he against it again today?

hé yǐ shí yán

何以食言？

Why do you go back on your own promise?