curriculum/challenges/english/blocks/learn-how-to-clarify-information-in-different-interactions/6641570410a46551973bb25c.md
The verb to think, in English, is irregular. Different from other, regular verbs, which get -ed added to them to form the past, when you want to use the verb think in the past, you use the word thought. Example: I thought you were out of town, meaning you imagined that the other person traveled to some other place.
The question What happened? indicates you are asking someone to explain an event or situation. For example, if you see someone looking upset, you might ask, What happened? to understand why they are upset. It means you want to know what made the other person upset. If you see someone with an arm or a leg in a cast, you can ask What happened? to understand how the person got hurt.
Listen to the dialogue and fill in the blanks.
Bob: I think there was a mix-up.
Maria: Oh really? I BLANK it was all okay. What BLANK?
thought
The past of the verb to think. It's an irregular verb. Be careful!
happened
The past of the regular verb to happen. The question means you want to understand a situation.
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