although一定要放句首吗

although并不是一定要放在句首。

althugh引导的从句放在主句前后都是可以的，有时也可以放在句中。

althugh引导的从句不可以与but，however连用，但是可以与yet、still连用。although放在句首(此时多用逗号与主句分开)，放在句末(此时用不用逗号均可)，用于句中表强调。

although

解释：conj.虽然，尽管。

例句：Although he was experienced, he was not infallible.尽管他经验丰富，却并非不会出错。

Although it is tasty, crab is very filling.螃蟹虽然好吃，但很容易让人饱。