we do not know when man first began to use salt,but we do kn

we do not know when man first began to use salt,but we do kn 英语翻译We do not know when man first began to use salt,but we d 英语翻译We have no idea about when man first began to use salt,b We don`t know when we shall start .(改为to do 的结构） We don`t kn We usually____each other when we do not know what to do .解释句 英语翻译Because we do not know when we will die,we get to think I do not know when we shall leave for Nanjing. We may not know how to use the ____ when we need to contact when do we use capital letter 请老师批改When we use the word “creation”,we do not simply mean “ We talk about and use the Internet every day,but do you know when we use public document ,where do we see them