| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been [v-ing] [art] [noun sg] | 11 |
|
| 2 | must have be [v-ing] [art] [noun sg] | 11 |
|
| 3 | must have be [v-ing] [art] [noun sg] | 11 |
|
| 4 | must have be [v-ing] [art] [noun sg] | 11 |
|
| 5 | must have be [v-ing] the [noun sg] | 6 |
|
| 6 | must have be [v-ing] the [noun sg] | 6 |
|
| 7 | must have be [v-ing] a [noun sg] | 5 |
|
| 8 | must have be [v-ing] a [noun sg] | 5 |
|
