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1. 你只要打个电话就知道她是否会来了。 You only have to have a call in order to know if she will come here
2. 我只要去问问老师就能解决这个问题了。i only have to ask teacher in order to can solve the problem
3. 你只要买一些报纸就能找到你需要的广告了。you only have to phurase some newspaper in order to find the advertisement which you need