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."
You could use either all of which are... or which are all...
She plays very well is the correct way to say it.
"On a train" is correct grammar.
Either form is acceptable.
The grammar is correct as it is.
Grammar.
All is well
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, "will be had" is not a correct grammar. The correct grammar would be "will have."
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.
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, 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."