CORRECTION:

1.
Chanjong:I obey my parent's.
correct: I obey my parents.

* Remember that we use apostrophe for possession or ownership not for plural form. ^^

2.
Chanjong: I follow the rules.
correct!

3.
Chanjong: rules are good.
correct: Rules are good.

*Don't forget to capitalize the first word of your sentence.

~~~~~