in a后面加什么

in a后面加名词，形容词；

in 是介词,后面可以跟名词、宾格人称代词或者动名词做介词宾语,构成介词短语,在句中充当各种语法功能,比如定语、表语、状语等等。

This tool can be used in a variety of ways.

这一工具有多种用途。

There are only so many hours in a day.

一天不过这么几个小时。

They had achieved a lot in a short space of time.

他们在短时间内取得了很大的成绩。

Events could have developed in a dramatically different way.

事情本来可以发展成另一种样子。

In a way it was one of our biggest mistakes.

从某种意义上来说，这是我们所犯的最大错误之一。

Many people are investing in a small way in the stock market.

许多人都在小量地向证券市场投资。