| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | in [v-ing] [pers pn] [prep] the | 79 |
|
| 2 | difficulty in [v-ing] [prep] the | 47 |
|
| 3 | difficulty in [v-ing] [pers pn] [prep] | 18 |
|
