Bonjour,
Réponse :
We ate (eat) out yesterday.
eat : verbe irrégulier
What happened (happen)?
Ici "what" est sujet donc question sans auxiliaire
Did you win the competition last Sunday?
forme interrogative : did + sujet + base verbale ....?
Sammy spent (spend ) a wonderful holiday
spend verbe irrégulier
He visited (visit ) the capital
visit : verbe régulier ( => base verbale+ed)