What is the greatest challenge when teaching English as a foreign language不是翻译

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• What is the greatest challenge when teaching English as a foreign language不是翻译
• 麻烦帮我翻译一下：1.the first textbooks written for teaching english as a foreign language came out in the 16th century.2.the weather turned out to be very good,which was more than we could expect.3.we all write now and then,even when there's not much to say.
• What is the greatest challenge when teaching English as a foreign language
• 什么情况下用 be in bed?什么情况下用stay in bed?
• stay in bed 和stay in the bed 有什么不同?可以是stay on bed