Both are correct, in different contexts. Use "on" when referring to grounds or buildings, and "in" when referring to personal items like belongings. For example, They found oil on my propertyrefers to the land, while They found the evidence in his property means they were searching his personal affects.
It should be "property vested in," as "vested in" indicates ownership or control being placed in something or someone, while "vested to" is not grammatically correct.
I don't know what you mean by 'preposition property' but at is a preposition.At can be used at the end of a sentence or question:'What are you playing at?'
Yes, 'for free', is grammatically correct.
Yes. It is grammatically sound.
"Not like that" can be grammatically correct, depending on the context.
Yes! That is grammatically correct!
No, it is not grammatically correct to say "what a fun." It should be corrected to "What fun!" to make it grammatically accurate.
no it is not grammatically wrong but it is better to ask where are you if you want to use it in question...
'What a drunkard you are' is a grammatically correct English sentence.
"That was wrong" is a grammatically correct sentence.
Yes, this is grammatically correct.
"Off you go" is not grammatically incorrect.