1. It is better to have loved and lost than never to have loved at all.
2. I take it that you agree with me.
As far as I know, anticipatory "it" works like in the examples above. In both examples, "it" refers to "to infinitive phrase" and "that-clause".
3. Just think about it that you're alone in this world and have to live on your own.
However, I wonder whether it is possible to use the anticipatory "it" after a preposition as in example 3. I do think that in #3, "it" refers to "that you're...on your own", and #3 is correct English.
(To give context : "What? You don’t need any help from anyone, because you can do everything on your own? Just think about it that you're alone in this world and have to live on your own. You don’t think you’d need any help from anyone? Even in that situation?")
fire1 3. Just think about it that you're alone in this world and have to live on your own. This is loosely worded and is not formally correct English.
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fire13. Just think about it that you're alone in this world and have to live on your own.
This is loosely worded and is not formally correct English. A correct version would be:
Just think about the fact that you're alone in this world and have to live on your own.