query: "Why didn't he" vs. "Why did not he"
positive_passages.docid: 23132
positive_passages.text: "Why didn't (or did not) somebody do something?" or "Why did somebody not do something?"
negative_passages.docid: 40839
negative_passages.text: Difference between Present Perfect and Past Simple ( I am not a beginner )
negative_passages.docid: 108964
negative_passages.text: Difference between "I haven't" and "I've not" etc
negative_passages.docid: 557
negative_passages.text: Should I use the past tense with did?
negative_passages.docid: 77255
negative_passages.text: Is the sentence structure "because... and so" grammatically correct?
negative_passages.docid: 103953
negative_passages.text: "I didn't know" or "I haven't known"?
negative_passages.docid: 98035
negative_passages.text: When do I use "was" and when do I use "were"
negative_passages.docid: 17238
negative_passages.text: Is "aren't I" correct grammar?
negative_passages.docid: 16897
negative_passages.text: Ambiguity in Negation: "John did not come because of the rain"
negative_passages.docid: 136104
negative_passages.text: grammar: why do we or omit the "do"
negative_passages.docid: 71914
negative_passages.text: "Didn't use to get" or "Didn't used to get"?
negative_passages.docid: 62938
negative_passages.text: "Not able to" vs. "unable to"
negative_passages.docid: 134223
negative_passages.text: dummy "it" + was/were?
negative_passages.docid: 146182
negative_passages.text: "How come" vs "Why?"
negative_passages.docid: 655
negative_passages.text: "How it works?" vs. "How does it work?"
negative_passages.docid: 104764
negative_passages.text: Use of Past Simple vs Past perfect in sentences with since
negative_passages.docid: 151460
negative_passages.text: Difference between "was to . . ." and "was to have"