| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] to be | 17502 |
|
| 2 | [adj] to be | 15347 |
|
| 3 | difficult to be | 132 |
|
| 4 | difficult to [be] | 132 |
|
| 5 | difficult [prep] be | 132 |
|
| 6 | difficult to [be] | 132 |
|
| 7 | difficult to be | 132 |
|
