| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficulty [be] that | 114 |
|
| 2 | difficulty be [that] | 114 |
|
| 3 | difficulty is [that] | 95 |
|
| 4 | difficulty [is] [that] | 95 |
|
| 5 | difficulty [was/were] [that] | 19 |
|
| 6 | difficulty was [that] | 19 |
|
