It means it (most likely/probably) is a grammar mistake. However, I do think that Microsoft Word (any version) has and can make mistakes with grammar and/or spelling.
what ever it wants to be
Word also has a grammar checker that displays a green wavy line below a phrase or sentence when a POSSIBLE grammatical error is detected. Right click the green wavy line to display suggested corrections.
end mark
Green wavy underline indicates grammar "mistakes" (you have to turn the grammar correction function on to have Word indicate it has found mistakes)
The word is mispelledA RED squiggly line means the word is misspelled. A GREEN squiggly line means that there is one or more extra space or tab characters that aren't grammatically needed.
The green line means a grammar mistake. The red line means a spelling mistake.
The red wavy line indicates Microsoft Word thinks the word you've typed is misspelled, or that you've inserted a proper name or jargon not in the Word dictionary. If you see a green wavy line, the application thinks you've used bad grammar. You can turn these features on and off under the Tools menu: Spelling and Grammar, Options. Notice the first item under Spelling says, "Check spelling as you type." When this box is ticked, the application checks spelling in real time and notifies you of (suspected) errors by placing a red, wiggly line under the word. If you find this annoying, you can turn it off by un-ticking the selection box. This is also true of the green squiggly line generated by the grammar checker.
A double bar line indicates the end of a section in music.
This usually means that the way you have been writing is grammatically incorrect.
It looks for grammar errors in your document. These can be things like structure of sentences, punctuation and errors in grammar. Any that it finds are highlighted by a wavy green line under the part that has an error. It also gives an explanation of the error.
The slash s before a name on a signature line typically stands for "for" or "on behalf of." This indicates that the person signing the document is signing in a representative capacity for someone else or a group.
A red wavy line indicates a possible misspelled word.The green wavy line indicates grammar errors or sentence format errors.