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否定形式,意為動作 “ 到 ??才 ??” 開始發(fā)生。如: She didn’t get up until her m other came in. 注意: till和 until通常情況下可以互換,只是在句首時 until比 till更常用。 、 although 均引導(dǎo)讓步狀語從句,意為 “ 雖然 ??” , although 較正式, though最常用。如: Thouth (Although)he was tired,he kept on working. 注意: though、 although引導(dǎo)的從句不能與 but、 however 連用,但可以與 yet、 still 連用。 though還可以與別的詞結(jié)合使用,如 even though、 as though,而 although則不能這樣搭配。 sooner ? than 、 hardly ? when、 as soon as 三者都表示 “ 一 ?? 就 ” , “ 剛剛 ??就 ” 的意思。 (A)as soon as 置于主句前后都可以,而且有備各種時態(tài)。 如: As soon as she gets here I’ll tell her about it. Mary left as soon as the finished the work. (B)hardly ? when 、 no sooner ? than 不能表示將來的事,其主句的謂語動詞一般用過去完成時,從句用過去時。若將 hardly或 no sooner 放在句首 ,句子要倒裝。 如: No