How to form 'passé composé' sentences?

First of all, we should know that to form 'passé composé' sentences, we first have to learn about two verbs: avoir (to have) and être (to have). These verbs are known as 'les verbes auxilliares To find more click here.

To transform verb into past tense we divide them into three groups.

1st group                               2nd group                             3rd group
verbes ending                    verbes ending in                         the rest  
in -er                                          -ir                             -oir, -uir, -pre, -ire, etc.

To transform the first group, we just remove the -er and and put -é.   Eg: regarder  to  regardé

To transform the second group into participe passé, we just remove the r from -ir.  Eg: dormir  to  dormi

Transforming the third group in participe passé is much more complicated. I will add this part when we are finished with it in class.