1. "I took it upon myself to free my countrymen."

2. "I have it in me to become an actor."
In the above two sentences, is "it" a "dummy it" or an "anticipatory it" acting as provisional subject to
"to free my countrymen" and "to become an actor" ?
It seems anticipatory to me: I took 'to free my countrymen' upon myself.
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I thought so too.
What about the second sentence ? Is "it" anticipatory in it too ?
I have to become an actor in me.
Yes. Keep in mind that I rearranged solely to prove the use of 'it' and that 'to become' is a theoretical alternative to 'becoming' - both as nouns.

after reading all this I got confused.

What is a "dummy it" and "anticipatory it"??

Thank you

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It is an 'it' that doesn't really stand for anything ('It's raining.') or just substitutes for the real subject ('It's your birthday that we're celebrating.') The main function is to move the meaningful content farther along the sentence where it receives more emphasis.