Teacher in CHILE. Do you use Spanish in your English Class?

This is what the teacher in Chile wrote:

"let me tell you that... indeed sometimes it is a need to explain some grammar rules or idioms using Spanish. I often do it during grammar lessons or explanations and according to the teachers evaluation process criteria 2008; as an english teacher there are situations where you can`t avoid using mother tongue. then, you can speak spanish in order to keep communication process on. when I use some Spanish expression immidiately I paraphrase in English and then Spanish and English as a sandwich... but this case is presented mostly in primary and junior classes."