Definition from macmillandictionary.com
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A change in temperature may make moisture form on the windows.
A smile formed on his lips.
A plan began to form in her mind.
She formed a deep attachment to the child.
The valley was formed by erosion.
He has been with the club since it was first formed in 1972.
The interview will give you a chance to form an impression of the company.
The boys and girls formed a line behind their teacher.
A dozen or so armed guards formed a ring around the exit.
Roll the clay between your hands and form it into a ball.
Fieldwork forms an important part of the course.
Mountains form a natural barrier that keeps invaders out.
Land ownership formed the basis of their wealth and power.
Her character was largely formed by the loss of her family in the war.
You normally add ‘-ing’ to form the present participle of English verbs.