כי in English:

That's because you're a girl.

If you're tired, why don't you go to sleep? "Because if I go to sleep now I will wake up too early."

Because of its origins, Canadian English has features of both American and British English.

Barter, however, was a very unsatisfactory system because people's needs seldom matched exactly.

Tom had to have his stomach pumped because he had accidentally eaten some rat poison.

Tom killed Mary because he found out she had started the fire that had killed his family.

Because of some technical problem, a movie was shown in place of the announced program.

Because of heavy snow, the plane from Beijing arrived 20 minutes late.

Even at the end of the nineteenth century, sailors in the British Navy were not permitted to use knives and forks because using them was considered a sign of weakness.

Needless to say, because of the accident, he will stay away from school for a while.

Tom has to be careful about what he eats at restaurants because he's allergic to many foods.

When you send a telegram, brevity is essential because you will be charged for every word.

After school, Tom usually sticks around as long as he can because he doesn't want to go home.

Roger Miller became very popular because of the success of the songs "Dang Me" and "Chug-A-Lug."

Because of a shortage of work, half the staff was discharged.