Prepositions before Conjunctions :
He insisted on that he was not involved in the affair. (Not correct)
He insisted that he was not involved in the affair. (Correct)
I'm worried about if he's happy. (Not correct)
I'm worried about whether he's happy. (Correct)
The inspector questioned me where I had been. (Not correct)
The inspector questioned me about where I had been. (Correct)
Prepositions can be used together with conjunctions in some cases, that is to say, before
Prepositions cannot be followed by the conjunction THAT.
There are no simple rules, regarding the use of prepositions in such cases. It is always advisable to refer to a Standard Dictionary in case of doubt.
1. This is the tower that the King built. (Relative Pronoun)
2. This is place where I lived. (Relative Adverb)
3. Give me the book and take this file. (Conjunction)
In sentence (1) the Relative Pronoun THAT refers to the noun - tower and also joins the two parts of the sentences. (This is the tower. & The king built.)
In sentence (2), the Relative Adverb WHERE modifies the verb LIVED and also joins the two parts of the sentence. (This is the place. & I lived.)
In sentence (3), the Conjunction AND simply joins the two parts of the sentence. (Give me the book. & Take this file.)
It may be noted that Relative Pronouns and Relative Adverbs also join. But they have more function than merely joining.
But Conjunctions merely join. They do no other function.
Preposition joins two words. It also governs a noun or a pronoun.
1. Sita sat beside Rama.
2. Sita stood behind Rama.
Prepositions before Conjunctions
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