Say each sentence aloud. Use the reduced forms.
Sentence Reduced form
I'm going to leave tomorrow. gonna
He's got to stop smoking soon. gotta
Do you want to meet my brother? wanna
They ought to bring a lunch. oughta
What are you doing here? whatcha
I will be out of town this weekend. outta
For the last sentence, did you change "I will" to "I'll?" You get extra points for using another reduced form, then!