| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [prep] the | 14418 |
|
| 2 | problem [prep] the | 1480 |
|
| 3 | problem [was/were] the | 70 |
|
| 4 | problem [was/were] [prep] | 26 |
|
