| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they have been [v-ing] [prep] | 256 |
|
| 2 | what have been [v-ing] [prep] | 67 |
|
| 3 | what they have been [v-ing] | 37 |
|
| 4 | what they have been [prep] | 7 |
|
