| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | problem be that | 720 |
|
| 2 | problem [is] that | 581 |
|
| 3 | problem is that | 581 |
|
| 4 | problem [was/were] that | 138 |
|
| 5 | problem was that | 138 |
|
