Hi, According to CGOEL, We can say: He played tennis for an hour. Simple statement of fact. But we can't say: It took him an hour to play tennis.
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norwolfAccording to CGOEL,Often the grammar books want you to see a particular interpretation of a sentence as the relevant reading. Here they want you to focus on "to play tennis" as an activity rather than as an accomplishment. As mention
We can say: He played tennis for an hour.
But we can't say: It took him an hour to play tennis.
norwolfAny mistakes?No. Not really. The first tennis example still seems a little weird to my ear, however. 'Playing tennis with someone' is somewhat ambiguous to me in terms of whether it's an activity or an accomplishment. I agree with your assessment of all the others. I think it's safe to say that you understand the underlying concept.