Present Simple or Future Simple. We...(leave) as soon as he...(arrive)
He says he...(telephone) as before he...(leave) the airport
She.....(stay) at home until sha...(feel) better
When....(you\visit)them? Probably next week
We will leave as soon as he arrives. He says he will telephone as before he leaves the airport. She will stay at home until she feels better. When will you visit them? Probably next week.