1) If he (knows) grammar better, he would (will make) fewer mistakes. -1
2) If you (take) the noon train, you will get there about four o'clock. -1
3) If I did not ( have) to work today, I (would go) to the park with you. -2
4) If it (is) so cold there, there (will be) snow on the ground. -1
5) If I (came) to Moscow, I (would visit) my friends. -2