You should use „haben“ when referring to verbs with an accusative object

(a)  

When using Regelmäßig (Regular), you take the third person singular ending and add ge-

Example: Machen -> Gemacht

(a)  

Kaufen in PP is

(a)  

Arbeiten in PP is

(a)  

When the verb ends in -ieren, you only need to turn it into 3rd person singular to make it Partizip II

(a)  

The PP of Telefonieren ist

(a)  

The PP of Studieren is

(a)  

With all irregular verbs, you only add a ge- to the beginning

(a)  

PP of Sehen

(a)  

Gehen‘s PP is

(a)  

For all Trennbare (separable verbs), you get to PP by putting the separable part, then ge, then the 3rd person singular of that verb

(a)  

Aufmachen (oder Machen Auf) PP ist

(a)  

What is the PP for an | rufen

(a)