| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] which they must | 22 |
|
| 2 | [noun sg] [prep] which they must | 19 |
|
| 3 | [prep] which they must [verb] | 28 |
|
| 4 | [prep] which they must [vb infin] | 28 |
|
| 5 | [prep] which they must have | 6 |
|
| 6 | [prep] which they must have | 6 |
|
