MODALS IN THE PAST
I’m at the airport, ready to catch my flight, but I can’t find my passport.
I must have left it at home.
It was my best friend’s birthday, but I didn’t call him/her.
I should have called her/him.
I’m running out of battery on my phone, but I don’t have a charger with me.
I should have brought the charger with me. /I should have charged it last night