| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult it [be] | 158 |
|
| 2 | difficult it be | 158 |
|
| 3 | difficult it [is] | 116 |
|
| 4 | difficult it is | 111 |
|
| 5 | difficult it was | 42 |
|
| 6 | difficult it [was/were] | 42 |
|
| 7 | difficult it 's | 5 |
|
