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hey arrived B) Would they arrive C) Were they arriving D) Were they to arrive 如果我們后天走之前他們到達的話,我們就舉行一次豐盛的宴會。 (, D對) (3)條件狀語從句中的省略?!纠緾ome tomorrow if possible. 可能的話,明天來。I will buy a DVD set if necessary.必要的話,我就買一臺DVD。那么,除了if之外,是否還有其他連詞也可以引導條件狀語從句呢?回答是肯定的,不僅有,還有很多。這些詞由于出現(xiàn)的頻率較小,且用法較復雜一些,所以不如if為大家所熟知罷了。下面就這些詞的用法以例句的形式進行一下簡單總結?! ?. unless ,若不,除非在……的時候 You will fail to arrive there in time unless you start ,你就不能及時趕到那兒?! nless it rains, the game will be ,比賽將照常進行?! ?. on condition(that)...在……條件下,如果 on condition (that)...引導的條件從句是主句事件發(fā)生的前提條件或唯一條件?! can tell you the truth on condition that you promise to keep a ,條件是你答應保守秘密?! ou can go swimming on condition (that) you don39。t go too far from the river 。 3. supposing ,假如 supposing引導的條件從句表示一種假設條件?! upposing it rains, shall we continue the sports meeting? 倘若下雨,我們的運動會還要繼續(xù)舉行嗎? Supposing something should go wrong, what would you do then? 假如出了什么問題,你準備怎么對付? 4. provided ,除非,以……為條件 provided (that) +從句表示一種假設條件。 He will sign the contract provided we offer more favorable ,他就會在合同上簽字。 He won39。t be against us in the meeting provided that we ask for his advice in ,他就不會在會上反對我們?! 纳鲜隼淇梢钥闯鰅f, unless, on condition (that), supposing, provided等詞引導的條件狀語從句,主從句條件關系分明,結構清晰。但有些句子,雖沒有含條件關系的連詞,卻也隱含著條件關系,這些句子常用一些詞,如but for, without等引出一個介詞結構來表示條件,條件常常是虛擬的,或與事實相反的假設。如: but for 若非,要不是 But for the rain, we should have a pleasant ,我們的旅行肯定會很愉快。But for your help, we should not have fi