They'll

If they don't have a car, they'll come by taxi.

They'll never truly understand the essence of Japanese culture anyway.

They'll probably come by car.

They'll be glad if it rains soon.

Do you think they'll break the 10-second barrier in the 100-meter dash?

Be nice to your kids. They'll choose your nursing home, after all.

Ten to one they'll miss the train.

In all likelihood, they'll be away for a week.

They'll kill me.

I take it for granted that they'll get married.