| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] difficult [to-vb] | 989 |
|
| 2 | is also [adj] [to-vb] | 654 |
|
| 3 | [be] also difficult [to-vb] | 31 |
|
| 4 | be also difficult [to-vb] | 31 |
|
| 5 | [is] also difficult [to-vb] | 21 |
|
| 6 | is also difficult [verb] | 20 |
|
