| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] difficult to understand | 17 |
|
| 2 | it is [adv] difficult to understand | 9 |
|
| 3 | it is [not/n't] difficult to understand | 8 |
|
| 4 | it is not difficult to understand | 8 |
|
| 5 | it is not difficult to understand | 7 |
|
| 6 | it is very difficult to understand | 5 |
|
| 7 | it is very difficult to understand | 5 |
|
| 8 | it is difficult to understand [adv] | 19 |
|
| 9 | it is difficult to understand [Wh adv] | 18 |
|
| 10 | it is difficult to understand why | 9 |
|
| 11 | it is difficult to understand how | 9 |
|
| 12 | it is difficult to understand how | 9 |
|
| 13 | it is difficult to understand why | 9 |
|
| 14 | it is difficult to understand the | 5 |
|
| 15 | it is difficult to understand [art] | 5 |
|
| 16 | it is difficult to understand [art] | 5 |
|
| 17 | it is difficult to understand the | 5 |
|
