I could tell he was surprised from the expression on his face.
我能告诉他脸上惊讶的表情。
我可以告诉他是从他脸上看出惊讶的表情。
i could tell he was surprised from the expression on his face从他的表情我就能看出来他很惊讶
我告诉他，你的吃惊已经呈现在你脸上，
从他的表情我就能看出来他很惊讶
