Yes, you can think of it as second conditional, 'If you wanted it very much, I could tell you and Pooh sometime.' - I put the comment here as I cannot reply to yours.
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August 29, 2017
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It's because it's a conditional form.
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August 29, 2017
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Both are correct, the first one if you are talking about now, and the second if you are talking about the past. If you are talking about now it would be better to say 'can't' instead of 'don't'
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August 4, 2017
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It's not quite right. You need to use past simple (when I was in London) because you use a past time (a month ago). If you use a past time expression you cannot use present perfect. I hope that helps :)
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August 4, 2017
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Usually we use 'the' with world or earth because there is only one of these things. The phrase I would use would 'The world's population' but you could also use 'Global population' (without 'the') Let me know if you need more help with articles. :)