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I read below sentence.

I found it a strain having to concentrate for so long.

I guess this sentence means 'I got pressure that I can't give all my attention for long hours'.

My question is why there is 'having'? Does it imply 'have to concentrate'(indicating meaning of obligation) or 'have concentrated'(indicating present perfect)?

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  • “I got pressure that I can’t give all my attention for long hours” is not idiomatic English; no native speaker would ever say that. There is a fundamental difference between have to + infinitive and have + past participle. This difference remains the same regardless of what form of the verb have is used: it’s what follows (past participle vs. to + infinitive) that makes a difference. As such, I can see no way to understand having to concentrate as indicating the perfect aspect. – Janus Bahs Jacquet Feb 2 '19 at 15:31
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'have to concentrate'(indicating meaning of obligation)

I would say yes obligation.

I found it a strain having to concentrate for so long in that exam.

that makes it much more obvious doesn't it.

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