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完成句子 He told us whether ______ a picnic was still under discussion.(have) 【答案】to have 2．It is OK to leave an electrical appliance on so long as you are using it—if not，turn it off！只要你在使用电器设备，你便可以把它开着。如果不用就把它关掉！ (1)so long as/as long as只要 You may borrow my pen so long as you promise to give it back.只要你答应归还，你就可以把我的钢笔借走。 As long as you are happy，it doesn’t matter what you do.只要你高兴，做什么都没关系。 ①so long as相当于as long as，还可表示“既然；由于；就……来说”。 ②so/as long as还可构成同级比较句。as long as既可用于肯定句也可用于否定句，而so long as只用于否定句。 (2)本句中if not是if you are not using it的省略形式。if后跟so或not来代替上文内容。 Get up early tomorrow.If not(＝If you don’t get up early)，you will miss the first bus. 明天早起，否则你将赶不上第一班车。 He may not be at home then.If so(＝If he is not at home)，leave him a note. 那时他可能不在家，要是这样的话，给他留张便条。 if possible 如果可能的话 if necessary 如果必要的话 if any 假如有；即使有 We all know that，________carefully，the situation will get worse.(deal with) 【答案】if not dealt with 3．So if you are not using the lights，the TV，the computer，and so on，turn them off. 因此当你不用灯、电视、电脑等等时，将它们关上。 and so on用于不完全列举，相当于and so forth He has many hobbies—go fishing，go hiking，play table tennis and so on. 他有很多业余爱好——钓鱼，徒步旅行，打乒乓球等。 | 
