The word passed is a verb. Passed is the past tense form of pass.
I will pass the school on my way home.
Last night, we passed the school on our way home.
The words pass and passed show action. Pass and passed are verbs,
The word past is a noun. Something that happened before now is in the past. When we use the article the with a word, that word is a noun.
In the past, we have had several good speakers.
We learn about the past in history class.
Use passed when showing action. Use past when talking about a time before now.
▶It’s your turn. Decide which word goes in the blank – passed or past. The truck ____ us on the highway. Did you figure it out? Good for you!