It is necessary for us to master a foreign language.请问for us在句中做什么成分?

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• It is necessary for us to master a foreign language.请问for us在句中做什么成分?
• when visiting a foreign country, we might find the country's customs strange to us.请问这句中的strange to us做什么成分啊,为什么需要加is啊?
• It is necessary for us to master a foreign language.请问for us在句中做什么成分?
• when visiting a foreign country, we might find the country's customs strange to us.请问这句中的strange to us做什么成分啊,为什么需要加is啊?
• I will see to it that everything is ready.是什么句型 怎么翻译
• 求一篇英语作文（要原创的） 《Is Foreign Language Learning Necessary?》要求大约120字内容要求：1.目前各种英语软件应有尽有2.有人认为没有必要再学外语3.我的看法（9点15之前请务必给我）