单词的比较级与最高级

帮忙说一下这些单词的比较级与最高级 expensive low thin clean bad early fat

1.expensive ` more expensive the most expensive
2.low lower the lowest
3.thin thinner the thinnest
4.clean cleaner the cleanest
5.bad worse the worst
6.early earlier the earliest
7.fat fatter the fattest

expensive ` more expensive the most expensive low lower the lowest thin thinner the thinnest clean cleaner the cleanest bad worse the worst early earlier the earliest fat fatter the fattest