| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to have [been] [v-ing] [prep] [art] | 21 |
|
| 2 | [to-vb] been [v-ing] [prep] [art] | 21 |
|
| 3 | [to-vb] [been] [v-ing] [prep] the | 17 |
|
| 4 | [to-vb] [been] [v-ing] for [art] | 6 |
|
