1.although連接的讓步狀語從句,后面主句中不能再用連接詞but.
2.although和though 同義,
3.在短語even though（即使）和as though（仿佛,似乎）中不能換用 although.
4.倒裝句使用though,不嫩管用although.
如：young though he is,he knows a lot
5.though 可以做副詞,‘但是’,放在句尾,although不能.
如：English is difficult,interesting ,though.