1.   As he walked forward with his escorts, his knees trembled suddenly.

2.   Even though your knees trembled and your heart fluttered and you felt weak with longing, how could you melt, knowing that?

3.   Her knees trembled underneath her raincoat.

4.   There was an evil-tasting fluid in my mouth, and my knees trembled.

5.   His knees trembled with fear.

6.   No matter how much your knees tremble underneath, underneath the table.

7.   My knees trembled at the thought of par, now within my reach with just one putt.