怎样用be back ,be in ,be out分别造三个句子

怎样用be back ,be in ,be out分别造三个句子
怎样用be back ,be in ,be out分别造三个句子

怎样用be back ,be in ,be out分别造三个句子
1.I am being back.我正往回赶.
2.I will be in.我要进去.
3.you are out.你落伍了.They are out.他们出去了.