1.Hot-cold 2.leaf-leave
4.snow-snowy
3.lie-lying 6.take-took
5.open-opening 8..stop-stopped
7.luck-lucky 10.carry-carries
9.heavy-heavily 12.buy-bought
11.swim-swimming 14.warm-cool
13.good-best 16.sun-sunny
15.tooth-teeth 18.slow-slowly
17.that-those
1.is swimming
2.is'not doing
3.were do