| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [v-ing] [art] [noun sg] | 1186 |
|
| 2 | must have [been] [art] [noun sg] | 266 |
|
| 3 | must have [been] [v-ing] [art] | 20 |
|
| 4 | must have [been] [v-ing] [noun sg] | 8 |
|
