1. 你只要打个电话就知道她是否会来了。 you only have to call her in order to know weather she come
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 solve the trouble
3. 你只要买一些报纸就能找到你需要的广告了。 you only have to buy some papers in order to knfind the adversity you need