Anonymous There is a duration in both sentences so why present perfect simple for the second one . Because 'think' has different meanings in the 2 sentences. In the first, it refers to the process of brain operation (a duration).
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Anonymous There is a duration in both sentences so why present perfect simple for the second one .Because 'think' has different meanings in the 2 sentences. In the first, it refers to the process of brain operation (a duration). In the second, 'think poorly' = 'hold a negative opinion', which is a condition, not a process.