If you make an appointment with the doctor, you'll feel better before you see him.
correct
If I talking to you now, I will miss the bus.
incorrect (If I talk to you )
If he isn't careful, he would break them.
incorrect (he will break them)
If I don't go to the party, I won't meeting anyone.
incorrect (I won't meet)
If he miss the bus, he'll be late for work.
incorrect (If he misses the bus)
If you don't take an umbrella, you'll getting wet.
incorrect (you'll get wet)
If I can't borrow your dress, I won't go to the party.
correct
If you not do your homework, your teacher will asking you for it.
incorrect (If you don't do your homework, your teacher will ask you for it.)
If you buy a new carpet, you drop something on it the first day.
correct
If you won't get wet, you won't catch a cold.
incorrect (if you don't get wet)
If you arrive early at a party, everyone else will late.
incorrect (everyone else will be late)
If I am have a good computer, I will be able to study well.
incorrect (If I have a good computer,)
If he doesn't practice, he won't never play in a band.
incorrect (he'll never play)
If you lose something, you'll find it in the last place you look.
correct
If he don't get up now, he'll be late for school.
incorrect (if he doesn't...)
If I buy one of those, I won't be hungry anymore.
correct