1.good(副词) ------------------well
2.success(形容词)-------------successful
3.music(表示人的名词)---------musician
4.science(表示人的名词)-------scientist
5.hobby(复数) ----------------hobbies
6.life(复数) -----------------lives
7.sell(名词) -----------------sale
8.speak(名词) ----------------speech
9.boring(反义词)--------------interesting /funny
10.easy(反义词) --------------difficult
11.busy(反义词) --------------free
12.this(复数) ----------------these
13.it(复数) ------------------they
14.thank(复数) ---------------thanks
15.no(同音词) ----------------know
16.right(同音词) -------------write
17.aren't(同音词)-------------aunt
18.we(反身代词) --------------ourselves
19.they(反身代词)-------------themselves
20.nine(序数词)---------------ninth