If he doesn't read the map,
If it doesn't rain,
If it isn't sunny tomorrow,
If I have a headache,
I won't sleep
If the computer doesn't work,
If the telephone rings,
If you send the letter today,
if I drink coffee.
the picnic will be cancelled.
do not answer it.
he will get lost.
it will arrive tomorrow.
I will call a technician.
I will take an aspirin.
we will go to the beach.
