I fell about laughing when he told me the joke.
The house is quite old. It might fall apart soon.
He was almost falling apart. There was a lot of work to do.
They used to be close friends, but fell apart not long ago.
His friends fell away one by one after his company had gone bankrupt.
The girl’s face has fallen away after the serious illness.
He didn’t want to fall behind with the rent, but he really didn’t have money.
If you don’t study English hard, you may fall behind other students.
The old tree fell down in the heavy storm.
He carelessly fell down and broke his leg.
I was surprised that this project didn’t fall flat.
Though his performance fell flat this time, he didn’t lost heart.
Don’t fall for his sweet words.
She was so beautiful that he fell for her at the first glance.
The roof of the house fell in because of the heavy rain.
Be careful. Don’t fall in the pond.
When will the contract fall in?
The boy fell into the swimming pool.
The boy fell into conversation with the girl next to him.
This film falls into the class of comedies.
Fall in with
Most of the people fell in with his proposal in the meeting.
The quality of these products has fallen off lately.
The output of the factory has fallen off this month.
The naughty boy fell over and twisted his ankle.
Fall back on sth.
He spent all his savings, and had nothing to fall back on.
Lacking of food, the enemy had to fall back.
My colleague asked for a week’s leave, her work fell on me.
The wolf fell upon the sheep hungrily.
My friend and I were going to travel to Thailand, but our plans fell through because I didn’t get a visa.
It fell out that his decision was totally right.
She always falls out over money with her husband.