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