| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | problem that may [vb infin] | 27 |
|
| 2 | problem that may [verb] | 27 |
|
| 3 | problems that may [verb] | 25 |
|
| 4 | problem that may arise | 16 |
|
| 5 | problem that may arise | 16 |
|
