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