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Catherine's Grammar Explanation: Disagreements with auxiliary verbs:
Hello Beom! You're quite right: Keith and Joyce don't agree about how they met. In English, you can use auxiliary verbs to disagree with statements. Listen to this: Keith: Well, Joyce and I both went to a graduation party... Joyce: No we didn't! It was a birthday party. No, we, didn't. No shows that Joyce disagrees. We is a pronoun, and refers to the subject of Keith's sentence, and didn't is an auxiliary verb. Keith used a positive past tense main verb: he said went, so Joyce uses the past tense auxiliary didn't. It's negative because she disagrees. Listen again: Keith: Well, Joyce and I both went to a graduation party... Joyce: No we didn't! It was a birthday party. Here's another one: Keith: …so I was at the party with all of my friends… Joyce: No you weren't! You were on your own. This time, I was becomes you weren't, and of course, she starts with No. Let's listen to one more. Keith: And Joyce couldn’t find anybody to dance with her... Joyce: Yes, I could actually! Keith, you're such a liar!!! This time, Keith's statement is negative: - Joyce couldn't find – so Joyce disagrees by saying Yes, I could! Listen again: Keith: And Joyce couldn’t find anybody to dance with her... Joyce: Yes, I could actually! Keith, you're such a liar!!! Ok, that's all from me. Good luck with your grammar challenge!