English as a foreign language

I have a Bachelor's degree in EFL and I've taught English to Spanish speaking students for 6 years at a semi-private school in Chile, South America. Spanish is my native language; therefore, I am aware of the difficulties Spanish speakers may have when it comes to mastering a second/foreign language as English such as specific phonemes that are not in the Spanish phonetic system (th, some vowel sounds), intonation patterns (questions with falling intonation), among others.