Forming the perfect tense

The perfect tense is a past tense. Watch this video to see how it is created, and when it might be used.

Makeda wants to make a vlog about Marco's skills, but to that she needs to use the perfect tense to talk about what she's done - including using tasty sentence sandwiches!
The verb 'sein' - to be
Inverting verbs - changing word order
The verb 'haben' - to have