| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult it be for [noun pl] [to-vb] | 7 |
|
| 2 | difficult it be for [noun pl] [to-vb] | 7 |
|
| 3 | difficult it be [prep] [noun pl] [to-vb] | 7 |
|
| 4 | difficult it is [prep] [noun pl] [to-vb] | 6 |
|
