1. If you heard him speak Chinese, you would take him for a Chinese.
2. To hear him speak Chinese, you would take him for a Chinese.
(Does #1 mean #2?)
3. If you hear him speak Chinese, you will take him for a Chinese.
4. To hear him speak Chinese, you will take him for a Chinese.
(Does #3 mean #4?)
Yes, 1 and 2 mean the same thing, and 3 and 4 mean the same thing, too!
Nice!