Correct: Bob can't be at school because I haven't seen him all day., I could have lent you the money. Why didn't you ask me?, She knew everything. She must have listened to our plans. , She can't be stupid. She teaches Math at Harvard., She mustn't go to school. It's a public holiday., Incorrect: Bob didn't need to be at school. I hvaen't seen him all day., I should have lent you the money. Why didn't you ask me?, She knew everything. She could have listened to our plans., She shouldn't be stupid. She teaches Math at Harvard., She doesn't have to go to school. It's a public holiday.,

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