按要求进行词形转换。
1. family (复数)___________ 2. young(反义词) __________
3. short(反义词) ___________ 4. meal(复数) ______________
5. know(同音词) ___________ 6. active (反义词) ____________
7. Tuesday(复数) ___________ 8. have (第三人称单数) __________
9. help(形容词) ___________ 10. mountains(单数)___________