引导让步状语从句的从属连词。

主要的有although, though, even though, even if, while, however,

whatever, whoever, whenever, wherever等。如：

Although they are twins, they look entirely different. 他们虽是孪生, 但是相貌却完全不同。

I like her even though she can be annoying. 尽管她有时很恼人, 但我还是喜欢她。

You won’t move that stone, however strong you are. 不管你力气多大, 也休想搬动那块石头。

Whatever we have achieved, we owe to your support. 我们取得的一切成就都归功于你们的支持。

Whoever you are, you can’t pass this way. 不管你是谁，你都不能从这里通过。

Whenever I see him I speak to him. 每当我见到他，我都和他讲话。