Bạn tham khảo nhé:
$1$. If we pollute the air, we (have) will have breathing problems.
$2.$ He often (play) plays soccer but last Sunday he (play) played volleyball.
$3$. Maryam (stay) is staying with us at the moment.
$4.$ Tom (never eat) has never eaten Vietnamese food before.
$5.$ We might (go) go to the Moon in the future.