3.till, until作为介词式从属连词引导时间状语短语或状语从句,用于否定句时,结构为not …until (till),主句谓语动词延续与非延续皆可,意为“直到…才…”。用于肯定句时,只与延续性动词连用,表示“到…为止”。例如:They played volleyball until (till) it got dark./ They didn’t talk(延续性动词)until (till) the interpreter(译员)came./ He didn’t go to bed(非延续性动词)until (till) the his father came back.;until可以放在句首,till则不行,例如:Until the last minute of the match we kept on playing./ Not until he finished his work did he go home.(倒装);till, until只用于时间,以下句子是错误的:We walked till the edge of the forest.(要用as far as或to)。
4.because, since, as引导原因状语时注意使用上的区别:①如果原因构成句子的最主要部分,一般用because ,因此because引导的从句往往放在句末。用why提问的句子,一定用because回答。例如:He had to stay at home yesterday because he was ill.;②如原因已为人们所知,或不如句子的其他部分重要,就用as,或 since。since比as更正式些。as和since引导的从句一般放在句子的开头。例如:As you are tired, you had better rest./ Since everyone is here, now let’s begin.
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,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.
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