| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that it is often [adj] [verb] | 19 |
|
| 2 | that it is often [adj] [verb] | 16 |
|
| 3 | that it is often difficult [verb] | 9 |
|
| 4 | that it is often difficult [verb] | 9 |
|
| 5 | that it is often [verb] [prep] | 8 |
|
| 6 | that it is often [verb] [prep] | 8 |
|
