1.If he
doesn't arrive(not arrive)soon,we(have)
will have to cancel the performance!
2.It's a shame he lives so far away.If he(live)
lived near us,we(see)
could see each other much more often.
3.I don't feel like going out for a walk today.Besides,the weather's bad.If it
starts(start)raining,we(get)
will get soaked.
4.It was very unfortunate of Jack to invite both Mary and Stan.If they
hadn't met(not meet)at the party,they
wouldn't have querreled(not quarrel)again.