I'm not alone

一个人───single;不是───no

you still single?───你还是单身吗？

This single item will suffice to typify all the rest.───即此一端,可概其余.

They quoted 756 dollars for the single New York — London fare.───他们对纽约到伦敦的单程机票开价是756美元.

A single candidate is put forward and the people vote yes or no.───先推出一个候选人，由人们投票表示赞成或反对。

The soldiers were walking in single file.───战士们排成一列纵队前进.

We've lumped all the top students in single class.───我们把所有优等生都编在一个班里.

When will the single currency be operable?───什么时候实行单一货币？

You needn't puzzle over every single word or phrase in the book.───这本书用不着一字一句地抠.

A single fare is 170 dollars.

The longest journey starts with a single step.

Misfortunes never [seldom] come alone [single].

There was not a single person in the house.

He knocked his opponent down with a single blow.