| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] it must have be | 33 |
|
| 2 | [vb base] it must have been | 33 |
|
| 3 | [vb base] it must have be | 32 |
|
| 4 | think it must have be | 19 |
|
| 5 | suppose it must have be | 5 |
|
