It meant nothing to him, she could tell by his expression.

She could tell by his expression he was debating about whether or not to answer the question.

But Daniel could tell by his expression that he was getting warm.

He saw right through her, she could tell by his expression.

He can tell by my expression that I don't have a clue as to what he's talking about.

She could tell by his expression that it wasn't the first time he'd been asked to talk about the boat.

I can tell by your stupid expression that you know.

He could tell by her expression that she was angry.

But I could tell by her expression that he would.

"I can tell by your expression that you've read the document," he said.