Yes, "best possible" is correct grammar, as in this sentence: This is the best possible outcome considering the circumstances.
No. It is not correct.
All is well
Both are possible and correct.
The sentence "It lacks agreement Possible correct alternatives are He is the one of the men who does the work or He is one of the men who do the work" are not of correct grammar.
The correct grammar is 'you are'.
This is a correct grammar. But it is no possible to cash someone else's SS check.
Do you mean: "Are there ways to correct grammar?" Well yes. You see, it's sort of like grading. If someone says something or their grammar incorrect, and you correct them, you are like sort of correcting their grammar and this is the only way to answer your question so.
No, it is correct grammar, not a correct grammar.
"On a train" is correct grammar.
She plays very well is the correct way to say it.
no. Replace "good" with "well". "You washed the car well."