To quote my Chilean Year 7 maths teacher: you making da noise you go ausside. We all understood her perfectly. The class consisted of something like 15-20 nationalities, and as far as I can recall only one person had English as their first language.

is it grammatically correct? No. Did she have a strong accent? Indeed she did. However, she made an effort to pronounce each word separately. To be honest that makes all the difference. It doesn’t matter if she turned present to past tense or used the wrong preposition - it was perfectly understandable.