| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] [prep] | 6060 |
|
| 2 | [modal v] have been [prep] | 1264 |
|
| 3 | [modal v] have been [v-ing] | 1003 |
|
| 4 | [modal v] have [v-ing] [prep] | 5 |
|
