如果是因为忘记定闹钟，可以说My alarm didn't go off. 我的闹钟没响。
I lost track of time.
I didn't catch the bus.
I got lost coming here.
The traffic was a disaster.
I forgot my wallet at home.
I hit rush hour traffic.
I was tied up with some urgent business.
I couldn't find a parking spot.
I don't mean to be.
I didn't realize it was that late.
Please forgive me. I don't mean that.
I'm sorry to have kept you waiting so long.
Sorry, I was delayed by a last-minute meeting.
I fell asleep in the shower.
My father forgot to wake me up.
My left turn signal was out so I had to make all right turns to get to work.
My car ran out of gas on the way to work. I had to push it to a gas station.
I wasn't thinking and accidentally went to my old job.