10 oraciones interrogativas, afirmativas, y negativas en pasado perfecto​

I had already cleaned the house when my mother arrived.  

She had just left by the time he arrived.  

They did not come with us because they had visited this museum before.  

He asked me if I had ever been to Germany.

Had you changed your clothes before the end of the party?

He hadn’t cleaned the house before his mother arrived.

Had he cleaned the house before his mother arrived?

Had you already had dinner when i called to you?

Had she read the book beforw seeing thw movie?

Had I cleaned?

Explanation:

Affirmative: Sub+had+v+c

Negative: Sub+hadn't+v+c

Interrogative: Had+sub+v+c?

uhh i would say.. 100 years or innovation?