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1. When is it used the simple present and the present progressive?

Simple Present
We use the Simple Present to express the idea that an action is repeated or usual. The action can be a habit, ahobby, a daily event, a scheduled event or something that often happens. It can also be something a person often forgets or usually does not do. For example we use simple present for:
* Permanenttruths:
The sun rises in the east.
Gases expand when heated.
* Conditions and situations that exist at the present time
My mother wears glasses.
I work at Ace Electronics.
* Habitualactions
John travels to Spain every year.
I usually get up at 6:30.
* Comments and declarations
I hope everything will be all right.
I hear Sara has been promoted.
I don't agree with you.
*Future reference in describing scheduled events.
The plane leaves at 7:45 and arrives at 10:20.
* Future reference after some subordinating conjunctions.
I'll call you when I get to San Francisco.Present Progressive
The present progressive is formed by combining the verb "to be" with the present participle. (The present participle is merely the "-ing" form of a verb). In English, presentprogressive can be used to describe what is happening now, or what will happen in the future. For example we use present progressive for:
* Actions in progress at the moment of speaking
Shh. Thebaby is sleeping.
* Actions in progress around the present
I'm very nervous. I'm taking exams this week.
We're changing our accounting system at work.
* Temporary situations
He's visiting hisaunt in Miami.
She's studying Chinese.
I'm working at a law firm for the summer.
Compare: She works at a law firm.
* Planned future actions
We're leaving for Hong Kong tomorrow.
He'scoming home next week.
* Repeated actions (with always, constantly, etc.)
You're always complaining. You're never satisfied.
2. Which are the auxiliary used in simple present and present...