To talk about things you’ve done in the past, whether it was yesterday, last week, or last year, you will need to use a past tense. In German, you can use the perfect tense. This also exists in ...

The auxiliary verb (haben or sein) must be the second idea. These do not have an auxiliary and an infinitive. They are simply ich hätte - I would have - and ich wäre - I would be. They still must be ...