She shut the door again and sat down, her knees trembling.

My knees were trembling so hard, I could barely stand.

My knees trembled as we made for the great hall.

Six were dead, three wounded, one on his knees trembling with fear.

It certainly was a good place to make the knees tremble.

His knees were trembling so much with reaction that he wasn't certain they'd hold him.

Then, with his knees trembling, he served for the victory.

He found that his knees were trembling as if the ground under him had shifted.

My knees were trembling so badly I had to sit down.

His knees trembled, he was almost too weak to stand.