He is very understanding of my situation.

Hello teachers! Kindly help me. I need some clarifications regarding these sentences.
Is it correct to say:
Sentence#1. He is very understanding to me.
2. He is very understading to my situation.
3. He is very understanding for my situation.
I'm confused because I used an automatic grammar checker, it says that the word understanding is the error. All the while, I thought the problem is the prepostion. I need an explanation so please help me.
Furthermore, is there any tip as to when and how to use prepositions to and for?
Thank you.
He is very understanding of my situation.
hi tdol,
thanks for the immediate reply.
need to know also what's the best way to determine wether a sentence is transitive verb or intransitive.
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