[liquidk]

It depends. English is a lot more tolerant of inconsistencies than latin based languages, and the grammar rules are more disperse. Typically in latin based languages the rules are stricter, and it is less socially acceptable to violate them. English is surprisingly tolerant both in the rules and the social acceptance of not following them.

[mc32]

It's a good observation. In my experience, often speakers of non-English will suggest that we switch to English because they feel uncomfortable with my mistakes in their language, rather then put up with my attempt at speaking their language. English speakers don't typically do this even when they are versed in a second language.