Если нужны обычные предложения, то вот...
Okay, children, if you have bad habits, write them on a piece of paper, then crumple it and throw out, it will help you to get rid of them.
That nation has really strange customs.
When we were on the concert, I lost my friend in the crowd.
I'm making some cookies, would you like to join me?
My mother doesn't allow me to go to sleep late.
I wish you good luck on the competition!
Learning languages gives an opportunity of studying and working abroad.