Yes, 'for free', is grammatically correct.
Yes, although somewhat archaic. "Instead" is a shortening of this phrase.
yeah it sounds grammatically correct
The phrase "had already left" is grammatically correct. The phrase "had already been gone" is not grammatically correct.
yes, it is
No. The term should be "These."
Yes. It is a noun phrase.
Yes, the phrase 'what they're doing' is grammatically correct. For example: What they're doing is wrong.
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.
No, more better is not correct. Better is the comparative for the adjective good; best is the superlative and should be used instead of 'more better'.
The phrase 'at the discretion of' is grammatically correct. It means that a particular person has the authority to make a decision.