you're so helpful.回答应该是什么

你真是能帮得上忙！/您真帮了我的大忙！

helpful: [ 'helpful ] adj. 有帮助的,有益的

词形变化: 
副词:helpfully 名词:helpfulness 

例句与用法: 
1. it's often helpful during an illness to talk to other sufferers. 
 病中与同病者谈天常是有益的。 
2. i hired a car the day after landing and bought a comprehensive book of maps, which my found most helpful on the cross country. 
 着陆后的当天，我租了一辆汽车并买了一本内容详细的地图册。我觉得在穿越村的旅途中，这本地图是很有帮助的。 
3. knowing where a tool tip is at any time in a program can be very helpful. 
 随时知道刀尖在程序中的位置是非常有益的。 
4. lionel asked me how things were going at work, but i suspect he was just fishing for information that might be helpful to his own company. 
 莱昂内尔问我工作情况如何，不过我怀疑他只是想探听一些可能对他自己公司有帮助的消息。 
5. these tactics are unlikely to be helpful to you. 
 这种方法对你未必有用。 
6. maybe these nutrients are helpful to your health. 
 或许这些营养品对你的健康有帮助。 
7. the experience in army is helpful to him. 
 他从军的经历对他很有用。 
8. you ale very helpful. 
 您真帮了我的大忙。