| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must be [verb] [is] | 16 |
|
| 2 | [pron] must be [verb] is | 16 |
|
| 3 | [pron] must be [vb pp] [is] | 15 |
|
| 4 | [Wh det] must be [verb] [is] | 13 |
|
| 5 | what must be [verb] [is] | 7 |
|
| 6 | what must be [verb] [is] | 7 |
|
| 7 | which must be [verb] [is] | 6 |
|
| 8 | which must be [verb] [is] | 6 |
|
