1. Bildung vom Passive Voice Present Simple 
Im Present Simple wird das Passive gebildet mit:
am/is/are + Past Participle
2. Bildung des Passive Voice im Present Simple:
Bilde alle Passivformen von "invite":
1.P.EZ.: I am invited
2.P.EZ.: you are invited
3.P.EZ.m.: he is invited
3.P.EZ.w.: she is invited
3.P.EZ.s.: it is invited
1.P.MZ.: we are invited 
2.P.MZ.: you are invited
3.P.MZ.: they are invited
3. Beispielsätze:
a) Singular:
Aktive: He tells a story.
Passive: A story is told by him.
Passive Question: Is a story told by him?
Negation: A story is not told by him.
b) Plural:
Aktive: They build two cottages.
Passive: Two cottages are built by them.
Passive Question: Are two cottages built by them?
Negation: Two cottages are not built by them.
4. Modals Verbs:
Aktive: You must do your work.
Passive: Your work must be done.
Aktive: We can't find the book.
Passive: The book can't be found.
Aktive: I may sell my old car.
Passive: My old car may be sold by her.
5. Sätze mit zwei Objekten = 2 Lösungen:
Aktive: She gives me a present
Passive I: I am given a present by her.
Passive II: A present is given to me by her.
Aktive: She writes him a letter. 
Passive I: He is written a letter by her.
Passive II: A letter is written to him by her.
Verben, die zwei Objekte erlauben/verbs that may take two objects:
bring, give, offer, show, tell, write, allow, ask...