| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | problems that [vb mod] [be] [verb] | 24 |
|
| 2 | problems that [vb mod] be [verb] | 24 |
|
| 3 | problems that [vb mod] [be] [vb pp] | 22 |
|
| 4 | problems that [vb mod] [be] encounter | 7 |
|
| 5 | problems that [vb mod] [be] encountered | 7 |
|
| 6 | problems that may [be] [verb] | 6 |
|
