| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of problem be | 32 |
|
| 2 | of problems [be] | 26 |
|
| 3 | of problem [is] | 20 |
|
| 4 | of problem is | 20 |
|
| 5 | of problem [be] | 6 |
|
| 6 | of problem are | 6 |
|
| 7 | of problem [am/are] | 6 |
|
| 8 | of problem [was/were] | 5 |
|
