| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must be [prep] be | 5 |
|
| 2 | it must be to [be] | 5 |
|
| 3 | it must be [prep] [be] | 5 |
|
| 4 | it must be [prep] [be] | 5 |
|
| 5 | it must be [prep] [be] | 5 |
|
| 6 | it must be to [be] | 5 |
|
