I AM just about to finish my work.
I have a letter to send.
When will you make a presentation?
I'm nervous to make a presentation.
Do you know how to use the projection screen?
Each classroom has a flip-chart that you can use.
Good thinking that you're seeing your girlfriend.
I'm more than happy that i can do it for you.
Have a nice weekend.

Hi, Angel! Everything is perfect. I just added the verb "am" to the first sentence. You are really good in writing. I'm so impressed.