What is/are disadvantage(s) of using L1 or mother tongue in the English classroom?

[42tanawat055]

There are some disadvantages of using L1 in English classrooms. One of them is related to language interference. Personally, I think English teachers should reject using L1 or the mother tongue in the classroom because using the mother tongue can cause interference to the English language acquisition process. This refers to the negative transfer of mother tongue into English which can result in errors in many aspects such as semantic and grammatical ones.

Tanawat 055 4EN