| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] the [noun sg] | 693 |
|
| 2 | must have been the [noun sg] | 67 |
|
| 3 | must have been [v-ing] the | 13 |
|
| 4 | must have been [v-ing] [noun sg] | 8 |
|
