| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they have been [v-ing] [prep] | 252 |
|
| 2 | [conj] they have been [v-ing] | 246 |
|
| 3 | [conj] they have been [prep] | 242 |
|
| 4 | [conj] have been [v-ing] [prep] | 190 |
|
