query: Buy action in the past need the past perfect or the present perfect?
positive_passages.docid: 8497
positive_passages.text: When is the past perfect exactly needed?
negative_passages.docid: 75445
negative_passages.text: Shakespeare Use of present tense narrating a past action
negative_passages.docid: 103774
negative_passages.text: Present/past perfect when the object is a dead person
negative_passages.docid: 77813
negative_passages.text: Using perfect constructions after "since"
negative_passages.docid: 14757
negative_passages.text: Must had vs must have
negative_passages.docid: 129948
negative_passages.text: present continuous or be going to?
negative_passages.docid: 6542
negative_passages.text: Dilemma: Present Perfect Or Perfect Continuous?
negative_passages.docid: 53495
negative_passages.text: Why is 'present perfect' present if it happened in the past? And why is it 'perfect'?
negative_passages.docid: 12310
negative_passages.text: When is the present perfect tense used instead of the past tense?
negative_passages.docid: 104764
negative_passages.text: Use of Past Simple vs Past perfect in sentences with since
negative_passages.docid: 119517
negative_passages.text: What's the difference between the simple past tense and the present perfect?
negative_passages.docid: 69668
negative_passages.text: Do 'already' and 'just' require the present perfect?
negative_passages.docid: 49302
negative_passages.text: before/after + past or past perfect
negative_passages.docid: 37500
negative_passages.text: When should one use "should" and when should one use "must"?
negative_passages.docid: 48737
negative_passages.text: Using “used to” vs "would" when expressing something done in the past
negative_passages.docid: 114989
negative_passages.text: The logic behind present perfect/infinitive + present perfect
negative_passages.docid: 94293
negative_passages.text: Past perfect or simple past with 'ago'?