Both can be correct depending on the context.
"All is well" would be correct when talking about a situation.
"There was a storm last night, but all is well now."
"All are well" would be correct when referring to a group of people, or animals
"I went to check on the neighbours after the storm, and all are well."
She plays very well is the correct way to say it.
"On a train" is correct grammar.
Either form is acceptable.
Grammar.
The grammar is correct as it is.
All is well
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
Yes, that is a grammatically correct phrase. You might use it as follows: I answer questions as well as possible.
She plays very well is the correct way to say it.
No, the phrase "it is well" is not grammatically correct. It seems to be missing a verb or adjective to complete the sentence. You could say "It is well done" to make it grammatically correct.
No, it is correct grammar, not a correct grammar.
Well I think it is
The correct grammar is: "Are those correct?"
"On a train" is correct grammar.
Well first of all, you must have the correct grammar. Second you must not fail. So it is now impossible for you to do this task.
no. Replace "good" with "well". "You washed the car well."
Either is correct. There are also other options.Examples:I had an F in grammar but did well in math and science.I took an F in grammar but did well in drama.I got an F in grammar but did well in history and sociology.I received an F in grammar but did well in economicsI earned an F in grammar but I don't plan to be a writer.