| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult [to-vb] [noun pl] | 86 |
|
| 2 | be difficult [verb] [noun pl] | 86 |
|
| 3 | is difficult [verb] [noun pl] | 44 |
|
| 4 | be difficult [verb] [noun pl] | 17 |
|
| 5 | be difficult to find [noun pl] | 13 |
|
| 6 | be difficult find [noun pl] | 13 |
|
| 7 | was difficult [verb] [noun pl] | 11 |
|
| 8 | 's difficult [verb] [noun pl] | 10 |
|
| 9 | be difficult get [noun pl] | 8 |
|
| 10 | be difficult to get [noun pl] | 8 |
|
| 11 | be difficult make [noun pl] | 6 |
|
| 12 | be difficult to make [noun pl] | 6 |
|
