我们十年前就认识了.We ____ ____ ____each other ten years_____.当我担心我儿子的时候.When i ____ _____ ____my son.
问题描述：
我们十年前就认识了.We ____ ____ ____each other ten years_____.
当我担心我儿子的时候.When i ____ _____ ____my son.
答
第一句：We got to know each other ten years ago.
第二句：楼上的似乎有误，worry about 应该直接用，前面不需要加系动词be，即：When I worry about my son，如果一定要用三个词，这句话应该用词组be concerned about: When I am concerned about my son.
希望对你有帮助
答
got to know,ago
am worried about
祝你进步
答
我们十年前就认识了.We began to know each other ten years ago
当我担心我儿子的时候.When i am worried about my son.
答
began to know
am worried about