I thought you could give me an answer to my question. 我觉得你能够回答我的问题。

　　I'd like to give you an answer after work. 等我下班了，会给你一个答复的。

　　I'll give you a firm answer by Friday. 我会在星期五之前给你一个准确的回复。

　　Could you give me an answer by tomorrow? 你能在明天之前给我个答复吗？

　　Sure, I'll let you know by tomorrow.  好的，明天就答复你。