1.

We are going to the theater tonight. We have tickets. 

2.

"What are you doing tomorrow evening?"  "Nothing, I'm free."

3.

I'm going away tomorrow morning. My train is at 8:50.

4.

"Why are you putting on your coat?"  "I'm going out".

5.

Do you think Mariela will phone Mike tonight?

6.

She can't come to our house on Saturday. She's working.