| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [be] [verb] in | 944 |
|
| 2 | must [be] [vb pp] in | 917 |
|
| 3 | [vb mod] [be] sought in | 27 |
|
| 4 | [modal v] [be] sought in | 27 |
|
| 5 | must [be] sought [prep] | 16 |
|
| 6 | must [be] sought [prep] | 16 |
|
| 7 | must [be] seek in | 8 |
|
| 8 | must [be] sought in | 8 |
|
| 9 | must [be] sought in | 8 |
|
| 10 | must [be] sought in | 8 |
|
