| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have [been] [verb] to | 337 |
|
| 2 | [modal v] have [been] [v-ing] [prep] | 288 |
|
| 3 | [modal v] [verb] [been] [v-ing] to | 39 |
|
| 4 | [modal v] have [be] [v-ing] to | 38 |
|
