How grammar impact communication?

We have no idea what you're saying.

Does that help?

Okay, we have some idea. But we're not certain. Using correct grammar and spelling tends to remove ambiguities, because if the grammar and spelling aren't correct, we have to make guesses about what you're really trying to ask, what the misspelled Words are actually supposed to be (sometimes it's obvious; other times it's less so) and what Words you left out and where they should be inserted.