中译英：Mary来自新加坡吗？

does mary come from Singapore ?
what do Singapore people say?
john`s penfriend speak japanese very well

是：Is mary from Singapore?

Does Mary come from Singapore?
what language do Singaporean speak?
John's pen pal speaks Janpanese very well.

Is mary from Singapore?

Does Mary come from Singapore ?
John's pen pal speak japanese very well.

Is Mary from Singapore ? ( Does Mary come from Singapore?)均可

What language do Singaporeans(新加坡人有复数形式) speak?
What language does the Singaporean speak? 单三形式 句意等同上句 the Singaporean指新加坡人这一类人（在形容词前加the 表这一类人 比如the old 老人 the rich富人 the poor 穷人 等）

John's pen pal speaks Japnese well.仅对John的一个笔友

John's pen pals speak Japnese well.对John的很多笔友。