1) i be really mean to her, but i don't want to treat her like that 2) you follow the law or yoy will go to jail 3)i go to the wedding. i have to work on the same day

1) I can be really mean to her, but i don't want to treat her like that. 2) You must follow the law or you will go to jail. 3)I can't go to the wedding. I have to work on the same day.

1 I could be really mean 
2 you must follow 
3 I can't go