What is apostrophe in grammar?

It should be spelt as "g-r-a-m-m-a-r".

When the word is a possessive regular plural. If you make the word plural by adding an s, this is regular, and then if you want to make it possessive you'd add the apostrophe. For instance: The...

It would just be it's because if you think about it, the apostrophe goes between it and has, you would just remove ha from it'has and make it it's :)

As you've written it, there's no apostrophe and is not meant o be one. But you might be asking what is the contracted form of you will, in which case the answer is you'll.

The contraction of we had is we'd.The apostrophe is the little superscript punctuation mark between the e and the d.