1.though/although意为“尽管、虽然”,两者可以互换,都可以与yet,still或nevertheless连用,但不能与but连用;
Although it's raining, they are still working in the field. 虽然在下雨,但他们仍在地里干活。
2. even if/though意为“即使,尽管”;
I’ll overcome all the difficulties, even though it should cost me my life. 我要克服一切困难,即使要献出我的生命。
3. as或though引导让步状语从句时,要用倒装结构,即表语或状语(形容词、副词、分词、实义动词、零冠词的名词)提前;
Child as/though he is, he knows a lot of the computer. 尽管他还是个孩子,但他却懂得很多有关电脑方面的知识。
4.while意为“尽管,虽然”<=although/though>;
While there was no conclusive<令人确信的> evidence, most people thought he was guilty. 虽然没有确凿的证据,大多数人还是认为他有罪。
5.whether…or…意为“不管…还是…”;