let,s are good friend还是let,s be good friend

let,s are good friend还是let,s be good friend let's be good friend 为什么用be Let's ______(be) good friend.这怎么做? Let's be good friend .指出错误单词 Let's be good friend.哪个单词错了? Let's___________(be) good friend -Let's be friend,___________? Let's be good frieds,---? Let's (are) good friends let's (are)good friends 想下载Let's just be friend let's just be friend下载