His lips were trembling, but still he held her hands.

But she did not move, and he saw her lower lip trembling again.

The girl looked him full in the eye, her lip trembling.

It was difficult to look at Tom without his lips trembling.

Her lips trembled, as though she were trying to say something.

My lips were trembling so hard I could barely get out the words.

I smiled at him, my lips trembling only a little.

Her lips trembled so that for a long time she could not say anything.

His lips were trembling like a child that is about to cry.

Then he saw that her lips were trembling, and she was trying not to cry.