| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [prep] [pron] must [vb infin] been | 10 |
|
| 2 | [det] [prep] [pron] must have [been] | 10 |
|
| 3 | [det] of [pron] must [vb infin] [been] | 9 |
|
| 4 | some [prep] [pron] must [vb infin] [been] | 5 |
|
| 5 | [det] [prep] [pers pn] must [vb infin] [been] | 5 |
|
