| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [modal v] be [prep] | 572 |
|
| 2 | [pron] must be [prep] | 436 |
|
| 3 | they must [be] [prep] | 52 |
|
| 4 | they must be [prep] | 52 |
|
| 5 | they must be [prep] | 52 |
|
| 6 | they must [be] [prep] | 52 |
|
