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He insisted on it that he might go with me.
Is the above grammatically correct?
The teacher said the noun clauses which start with that can't follow the preposition "on" but can be corrected by inserting "it" before the "that clause..."
I saw the above on YouTube video about prepositions.

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JigneshbharatiHe insisted on it that he might go with me.
Is the above grammatically correct?

To me, this feels like literary English from an old book. It is not modern conversational English.

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JigneshbharatiHe insisted on it that he might go with me.
Is the above grammatically correct?

Yes.

JigneshbharatiThe teacher said the noun clauses which start with that can't follow the preposition "on" but can be corrected by inserting "it" before the "that clause..."

That sounds a correct bit of advice. Even so, you can also correct the mistake in that specific sentence by removing 'on', which gives

He insisted that he might go with me.

And in some cases you can correct the mistake by using an -ing construction after 'on', which gives

He insisted on going with me.

(But this version leaves out 'might', the idea of 'maybe'.)

CJ

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Thanks. Is it grammatically correct? Can a preposition be followed by a noun clause which starts with that?

 CalifJim's reply was promoted to an answer.
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Jigneshbharati Is it grammatically correct?

I don't think there is a black and white answer to this. To some people it may appear incorrect. On the other hand, if I were to read it in a book written, say, in the 19th century, I would accept it as an old-fashioned way of writing.

JigneshbharatiCan a preposition be followed by a noun clause which starts with that?

I can't think of any obvious examples in ordinary English. It is hard to be certain that no examples can exist (maybe in poetic language) without doing extensive research.

JigneshbharatiHe insisted on it that he might go with me.
Is the above grammatically correct?

Just to clarify my previous answer. "He insisted on it that ~" is not in itself necessarily old-fashioned-sounding. The flavour of your sentence is dictated more by the combination of this and the "that he might" wording.

JigneshbharatiCan a preposition be followed by a noun clause which starts with that?

It's not common, but it's possible.

Although dianthus can grow very tall, you can be comforted in that they do not need to be staked.

I suspect that 'in' is the only preposition that occurs in this pattern.

CJ

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