Is using the phrase is all correct grammar?

"Is all" is grammatically correct in certain contexts, but it's often used incorrectly. Here's a breakdown:

Correct Use:

* As a question: "Is all the work done?"

* In a specific phrase: "Is all well?" (Meaning "Is everything alright?")

Incorrect Use:

* As a substitute for "is everything" or "are all": "Is all good?" (Should be "Is everything good?" or "Are all things good?")

Why the confusion?

The issue lies in how the phrase is used colloquially. It's tempting to shorten "is everything" to "is all," but this creates a grammatically incorrect structure.

Remember: "Is all" is best used when referring to a singular, collective entity, like "Is all the work done?" If you are referring to multiple things, use "are all" or "is everything".