英语说:你认为你不说我就不知道了吗?有把握的朋友帮我下.谢谢

Do you think I'd know nothing if you don't say it?

Do you think I still don't know what has happened if you keep silence.

楼上全错。全是中式英语的思路。

You think I didn't know about this as you kept it to yourself?

应该是 Do you think that I won't know if you don't tell me?
或 Do you think that if you don't tell me then I won't know?

用将来时---〉现在时时态，反之亦然。

Did you think that I won't know if you don't tell (me)?