| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] problems remain to [be] | 5 |
|
| 2 | [adj] problems remain to [be] | 5 |
|
| 3 | problems remain to [be] [vb pp] | 6 |
|
| 4 | problems remain to [be] [verb] | 6 |
|
