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I don't encourage using L1 in the classroom at all, even for YL. The reason behind this is that YLs are very much able to pick up L280% more if they don't hear L1 in the classroom. There are quite some alternatives to using L1, like using visuals (flash cards, videos) and acting out or miming. They are much more creative and interesting to them as well.
Use of L1 (Native or first language of the students) has some advantages and some disadvantages. Certainly, this topic needs a detailed discussion. However, in short words I would like to suggest limited use of L1 for the beginners, occasional explanations of words or phrases in L1 at a later stage and complete elimination of L1 from the class at the final stage.
I usually use the L that I think it would be necessary according to the situation; the issue has nothing to do with in favour or otherwise. The type of the students and their backgrounds suggest the level we use in teaching.
I USE IT DEPPENDING WHEN THE SUTDENT NEEDS TO GIVE THEM FROM L1
Especially in the case of the young learners, our job is easier. For one reason, this age group is more tolerant to ambiguity than the other age groups. Moreover, because their cognitive and lexical level is limited, they don't need long and detailed instructions. Besides, most of the instruction (I believe) should be geared towards exposing them to "adequate comprehensible input", which leaves litle room for L1 use...