| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult [verb] [prep] [adj] | 316 |
|
| 2 | difficult [to-vb] [prep] [adj] | 314 |
|
| 3 | [adj] to think [prep] [adj] | 99 |
|
| 4 | [adj] to think [prep] [adj] | 96 |
|
| 5 | difficult think [prep] [adj] | 11 |
|
| 6 | difficult to think [prep] [adj] | 11 |
|
| 7 | difficult to think [prep] [adj] | 11 |
|
