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2、work on 继续工作，从事 ◆It is known that this scientist has been working on this problem for about ten years. 人们知道，这位科学家研究这一问题已达10年之久。 work on 还可表示“奏效”、“激起”、“努力说服”等意思。 ◆Wine will work on his emotion. 酒会使他情绪激动。 work out 算出，解答出；健身。 ◆I believe that you can work out this problem by yourself. 我相信你能自己解答这道难题。 ◆We hadn't expected that our evening party could work out so well. 我们从没想到我们的晚会会是如此的成功。 ①苏珊决定不在家里做这个方案，因为她怕她父母知道她在干什么。 Susan decided not to ________________ at home because she didn't want her parents to know what she was doing. ①work on the program ②一切都依计划而行。 Everything according to the plan. ②has worked out ③他每隔一天去体育馆健身一次。 He goes to the gym every other day. ③to work out 3、辨析 if only, only if (1)if only 如果……多好，要是……就好了。常用虚拟语气。 ◆If only one had an unlimited supply of money. 要是能财源不断就好了。 (2)only if 只有当……，只有在……的时候。引导的是客观条件状语从句，若这个从句位于句首，主句需要用部分倒装语序。 ◆Only if I get a job in the summer will I have enough money to go on my education next term. | 
