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No they can't speak without grammar, Because the rules are based on English
Of cousre he can, but he won't be able to write. Remember, a newborn child does not learn grammar.
I think people who speak a language without grammar very often lay themselves open to ridicule.
sure you can , but it will not be a perfect language . you will be able just to send the message and being understood to a certain level by others
Basically, we all have to study the basic for any language we learn ,without grammar you can speak somehow if you have vocabulary but still , grammar is essential.