though可以放在句首吗

可以。though和although都作“虽然”，“即使”解，通常可以互换。只是although的语气较重，它所引导的从句通常位于主句之前，常用以强调让步概念，而though可以放句首和句中第二位，常用于非正式的口语或书面语中，表示“虽然”，放在句末表示“然而”。

though和although的区别

1.though和although在一般情况下可以互换使用，though较为普通，常用于非正式的口语或书面语中，although则较为正式，另外although语气比though重，常用以强调让步概念。

(1)Though/Although it was raining we went there.虽然下着雨，但我们还是去了那儿。

(2)Though/Although it was barely four o’clock,the lights were already on.尽管才四点钟，灯已经亮了。

(3)Though/Although we are poor,we are still happy.我们虽然穷，仍然很快活。

(4)Though/Although my car is very old,I don’t want to buy a new one.虽然我的汽车很旧，但我不想买一辆新的。

(5)He insisted on doing it although I warned him not to.虽然我警告他不要做，但他仍然坚持要做。

2.even能和though组合表示强调，但不能和although组合。在这里even though=even if(no matter；though)即使……也……。

Even if/Even though we could afford it,we wouldn’t go abroad for our vocation.即使我们付得起这笔钱，也不出国度假。

3.当让步状语从句指某种假设情况时，通常用though而不用although。

(1)Though all the world were against me，I should still hold to my opinion.

(2)Though everybody deserts you，I will not.即使所有人都抛弃你，我也不会的。

4.though 可以独立用作副词，常放在句末，意为all the same(还是；仍然)或however(可是；然而)，而although无此用法。

(1)She didn’t tell me what she had done，but I know it though.她没告诉我她所做的事情，但我还是知道了。

(2)It’s hard work.I enjoy it，though.工作很苦，可是我喜欢。

5.though引导让步状语从句时可以倒装，而although从句则不能。

(1)Bravely though they fought,they had no chance of winning.虽然他们打得很勇敢，但还是没有机会获胜。

(2)Poor though I am，I can afford it.我虽然穷，但这动词还是买得起的。

(3)Child though he was，he did quite well.他虽是孩子，但做的很好。

though和although的相同点

1.在although和though引导的让步状语从句中，主句里不可用but，若要强调前后两部分的对比意义，可在主句前加yet或still。

Although/Though he has a lot of money，yet/still he is unhappy.他虽然有很多钱，但并不幸福。

2.although和though引导让步状语从句时，常采用省略形式。

(1)Although tired(=Although he was tired),he kept on working.虽然很疲劳，但他继续工作。

(2)The problem,though complicated(=though it is complicated),can be solved without much difficulty. 这个问题虽然复杂，但解决起来并不困难。