| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must have been [noun] [noun prp] | 7 |
|
| 2 | it must have be [noun] [noun prp] | 7 |
|
| 3 | it must have be [noun prp] [noun prp] | 7 |
|
| 4 | it must have be [noun] [noun prp] | 7 |
|
