| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [been] [v-ing] a | 52 |
|
| 2 | [modal v] [vb infin] [been] [v-ing] to | 38 |
|
| 3 | [modal v] [vb infin] [v-ing] to a | 16 |
|
| 4 | [vb infin] [been] [v-ing] to a | 6 |
|
