Your question is a little confused. "I'm going to go to Paris" is an example of "to be going to" used to talk about future plans.
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Bbk_agpIn the Headway's book, they said that the first sentence is not usable, and second one offered as an example of exception to the grammar structure of "to be going to". Are they right?I disagree. I don't see any reason why "I'm going to go to Paris" should be disallowed.
PeterT You might use: 'I'm going to go to ..." to announce your grand plan in advance, as also, 'I'm going to be studying at ..."; while 'I'm going to...' could refer to something as mundane as going to the store or banyo.I agree ... I was going to say exactly this, that while "going to go to" and "going to" may be almost interchangeable in some situations, I