| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | the problem is [conj] | 325 |
|
| 2 | the problem is [prep] | 54 |
|
| 3 | problem is [conj] [prep] | 20 |
|
| 4 | the problem [conj] [prep] | 17 |
|
