Yes, it is correct: educational is an adjective, a word that describes a noun; facility is a noun.
Yes, the phrase "Italian sausage" is supposed to be capitalized because "Italian" is a nationality-related adjective.
adjective phrase
adverb
Does Ravi have two pens? That is the correct way to ask if Ravi has two pens. It's also fairly common in english to phrase a statement as a question: Ravi has two pens? That is most often used when excitement or uncertainty is present. Ravi has four homes?!
adverb phrase
Yes, 'for free', is grammatically correct.
The phrase "how don't I" is not grammatically correct. A more correct way to phrase it would be "why don't I."
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
Yes
The phrase "Is you don't miss me do you" is not grammatically correct. It should be rephrased to something like "Don't you miss me?" to be correct.
The phrase "had already left" is grammatically correct. The phrase "had already been gone" is not grammatically correct.
yes, it is
No, it is not grammatically correct to say "keep stick to." The correct phrase would be "keep sticking to" or "stick to."
Yes. It is a noun phrase.
The correct phrase is "that was you," as the verb "was" agrees with the singular subject "you."
Yes, it is grammatically correct. "Part and parcel" is a phrase that originated as a legal term in the fifteenth century. It means an essential or integral part.
Yes, the phrase "I came home at about one o'clock" is grammatically correct. It follows a subject-verb-object structure and conveys a clear message about the time of arrival.