1
1send,will receive
2do,will improve
3will go,has
4will go,gets
5doesn't study,won't pass
6rains,won't have to
2
1were,would change
2would invite,had
3had,would sail
4told,would be
5would help,knew
6would buy,had
3
1had studied,would have passed
2had asked,would have helped
3had spoken,would have understood
4would have written,had had
5hadn't studied,would have walked
6hadn't taken,would have arrived