| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] [not/n't] [verb] [that] | 13 |
|
| 2 | is [adj] [not/n't] [verb] [that] | 13 |
|
| 3 | is difficult [not/n't] [verb] [that] | 7 |
|
| 4 | is difficult [adv] [verb] [that] | 7 |
|
| 5 | is difficult [not/n't] [verb] [conj] | 7 |
|
| 6 | [is] difficult [not/n't] [verb] [that] | 7 |
|
| 7 | [be] difficult [not/n't] [verb] [that] | 7 |
|
| 8 | be difficult [not/n't] [verb] [that] | 7 |
|
