Teach English without the help of the mother tongue, is it possible?

Based on personal experience as an English teacher the answer is yes. In order to achieve it the teacher need to be fluent in the language, and can act out many things when say, explaining the meaning of a word. The least would we using hand gestures. The students need to be made to read out in class regardless of their pronunciation and comprehension level. On an emotional level the teacher needs to be patient. It is worth it because when the students start to understand the language it becomes easier to teach them. Even my spouse, who is still teaching English, finds the methods that I use produce better results.

I once had an English teacher who tried to speak English all the time, but the students often asked if they were allowed to ask questions in Danish instead of English, because they found it easier to express the questions in Danish. It was hard to avoid sentences in Danish during the lessons, because the students knew that the teacher spoke Danish. It would have been a different situation if the teacher didn't speak or understand Danish at all, then the student would have been forced to speak English, but they often chose the easy way out (=their own language)

The best way to teach a new language is full immersion from day 1. There is no reason to use the primary language of the area.

Yes, you can teach any language, especially to children, but if you are teaching grown up people, it can be more difficult. It is so easy to take a short cut and ask in your own language if the teacher can speak that language too. Sometimes it can help to understand better. I learned Swedish without a Finnish teacher, but I was a child, only ten when I started and was surrounded by the language all day at school. I have also taught Swedish and had students who speak a, for me, foreign language. It works, no doubt, but when I have Finnish students, we talked Finnish too, as I had to explain some things to them so they could understand better.

i think you can learn english without the help of the mother tongue but it would take more time than getting help from your mother tongue. learning english without translations is like teaching toddlers how to talk. they will leran to speak but it would take some time. it is easier to remember words if you know the translation of this on your mother tongue. again we can all learn but it is much easier if there is help from the language we know better.