for后面加什么形式?

　　We're going to Germany for Christmas and New Year.

　　我们要去德国过圣诞和新年。

　　A good dictionary is indispensable for learning a foreign language.

　　一本好词典是学习外语必备的。

　　The book will be invaluable for students in higher education.

　　这本书对于高校学生将有重大价值。

　　Respect for life is a cardinal principle of English law.

　　尊重生命是英国法律最重要的原则。

　　For a long time his death was concealed from her.

　　他的死瞒了很长时间都没告诉她。