在他這樣的年齡該懂事些了英文怎麼說？

He ought to know better at his time of life.

他一點也不了解我們會計系統的基本細節英文怎麼說？

He doesn't know the nuts and bolts of our accounting system.

他不認識我英文怎麼說？

He doesn't know me.

起先我不知道發生了什麼事英文怎麼說？

At first I didn't know what had happened.

你知道這個字的來源嗎？英文怎麼說？

Do you know where this word comes from?
你知道這個字的來源嗎？英文怎麼說？

你知道漢堡嚐起來味道怎樣嗎？英文怎麼說？

Do you know what a hamburger tastes like?
你知道漢堡嚐起來味道怎樣嗎？英文怎麼說？

你知道他沒有來的原因嗎？英文怎麼說？

Do you know the reason why he didn't come?
你知道他沒有來的原因嗎？英文怎麼說？

你知道怎樣能使他高興起來嗎？英文怎麼說？

Do you know how we can cheer him up?
你知道怎樣能使他高興起來嗎？英文怎麼說？

我真不知道下一步做什麼。英文怎麼說？

I really don't know what to do next.
我真不知道下一步做什麼。英文怎麼說？

我知道你有了撒謊的想法。英文怎麼說？

I know you have the idea of telling a lie.
我知道你有了撒謊的想法。英文怎麼說？

我真不知道如何表達我的感激之情英文怎麼說？

Really, I hardly know how to express my gratitude.

我真不知道如何讓他高興英文怎麼說？

I really don't know how to pleasure him.

如果你有不識的字,可以查字典英文怎麼說？

If you don't know a word, you can look it up in a dictionary.

我真不知對我兒子該怎麼辦才好英文怎麼說？

I am at my wits' end to know what to do with my son.

任何一位稱職的工程師都應該知道那臺機器是如何操作的英文怎麼說？

Any engineer worth his salt should know how that machine works.

我知道我們正在做的事情是合法的，但不知甚麽原因總覺得不對勁。英文怎麼說？

I know what we're doing is legal, but somehow it doesn't feel right.
我知道我們正在做的事情是合法的，但不知甚麽原因總覺得不對勁。英文怎麼說？

我怎麼才能知道這個呢?英文怎麼說？

Whereby shall I know this?

傑克身在福中不知福英文怎麼說？

Jack doesn't know when he is well-off.

他們仍然不知道她的出身地和家庭門第英文怎麼說？

They still did not know her place of birth or her parentage.

先生,我需要您的指點。我不知該怎麼辦才好英文怎麼說？

I want your advice, sir. I don't know what to do.