By the time we land, we ... (sit ) in this plane for 9 hours.
will have been sitting.
.... you...... (do) anything exciting this weekend? -We ............ (have) a party if you want to come.
Are you doing / are having
The train ... (leave) at 8 am.
leaves
John has won the lottery!He says he ... (buy) a new car.
is going to buy
What time ....... the concert ......... (Begin)?
does / begin
