| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [verb] [to-vb] these problems | 14 |
|
| 2 | be [verb] [verb] these problems | 14 |
|
| 3 | [be] [vb pp] [verb] these problems | 10 |
|
| 4 | been [verb] [verb] these problems | 5 |
|
| 5 | [been] [verb] [verb] these problems | 5 |
|
