| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [been] [v-ing] at | 13 |
|
| 2 | [vb mod] [vb infin] [been] [v-ing] at | 13 |
|
| 3 | must [vb infin] [been] [v-ing] at | 5 |
|
| 4 | must [vb infin] [been] [v-ing] at | 5 |
|
| 5 | [vb infin] [been] [v-ing] at [art] | 8 |
|
| 6 | [vb infin] [been] [v-ing] at [art] | 8 |
|
| 7 | [vb infin] [been] [v-ing] at the | 6 |
|
| 8 | [vb infin] [been] [v-ing] at the | 6 |
|
