| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | problem was [verb] the | 12 |
|
| 2 | problem [was/were] [verb] the | 11 |
|
| 3 | problem [was/were] [to-vb] the | 8 |
|
| 4 | problem [was/were] [v-ing] the | 5 |
|
