So long as they have they have comprehensive English classes to get them speaking the language as quickly as possible, I don't see a problem. If they can't speak English, they can't learn in English. Forcing them to sink or swim based solely on their language ability is stupid and harmful to society in the long run.

1 + 1 = 2 in Spanish too.

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"Jesus said: I have cast fire upon the world, and behold I guard it until it is ablaze."
Gospel of Thomas