5、although和though引导让步状语从句往往用法一样,但注意以下区别:①although用于各种文体,而though则多用于非正式的口语或书面语中。注意由although, though引导的从句后,主句不能用but,但可用副词yet, still。例如:Although/ Though it rained all the morning, they still went on working.(或yet they went on working)②though常与even连用,even though表示强调,意为"即使",但不能说even although,例如:Even though I didn't understand a word, I dept smiling. ③though可用作副词,意为"然而",常用逗号与句子分开。although则不能这样使用,它只作连词。例如:It was a quiet party, I had a good time, though.
6、once作副词译"曾经",作为连词译"一旦",引导条件状语从句。相当于if的加强形式。例如:I don't believe he was once a thief. (once这里是副词)/ Once Aristotle had made up his mind that heavy objects always fell faster than light objects, he taught it as a truth to his students. (once连词)
7、unless引导条件状语从句等于if … not …。例如:He'll accept the job unless the salary is too low. ( = He'll accept the job if the salary is not too low.)
8、在用as if引导的方式状语从句及表语从句中,根据情况要使用虚拟语气。例如:He talks as if he knew all about it. 但有时也可用直陈语气。例如:It looks as if it is going to rain.
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