| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [vb infin] be several | 9 |
|
| 2 | [modal v] [vb infin] been several | 8 |
|
| 3 | [modal v] have be several | 8 |
|
| 4 | must [vb infin] be several | 6 |
|
| 5 | must [vb infin] be several | 6 |
|
