| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it must have been | 60 |
|
| 2 | [verb] it must have be | 60 |
|
| 3 | [vb base] it must have be | 32 |
|
| 4 | think it must have be | 25 |
|
| 5 | think it must have be | 18 |
|
| 6 | [vb past] it must have be | 17 |
|
| 7 | say it must have be | 8 |
|
| 8 | said it must have be | 6 |
|
| 9 | suppose it must have be | 5 |
|
| 10 | suppose it must have be | 5 |
|
