500
If you really want to learn a new language (like Swahili), you should try living in a country that speaks that language, that will give you the opportunity to speak with native speakers, it will also help you to listen to it being used in daily contexts. (2 errors)
RTS error #1 (...try living in a country that speaks that language ", that" will give you the opportunity...)
Correction: ;that/ .That/ , which (or some other conjunctions)
RTS error #2: native speakers", " it will also
Correction: ;/ .It/ and (or some other conjunctions)