This is not a sentence. There is no verb. ("Parking" is used as a gerund.) And I don't know what a "baement" is.
If you want to make it into a sentence, you could do something like "There is free parking in the baement[sic] carpark." Of course, if you are just trying to put up a sign directing cars to the parking area rather than doing an English homework assignment, the original phrase is more than enough to adequately convey the message.
"That was wrong" is a grammatically correct sentence.
This sentence is not grammatically correct. For the sentence to be grammatically correct, the space between "in" and "to" would have to be removed. Therefore the sentence should read "They are into skating."
The sentence is grammatically correct.
Yes, it is grammatically correct.
'Rhoda's crazy' is grammatically correct.
'What a drunkard you are' is a grammatically correct English sentence.
That sentence is grammatically correct.
Yes, the sentence is grammatically correct.
This sentence is grammatically correct.
This sentence is grammatically correct.
No it should be "You were not there"...
This sentence is grammatically correct.