| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [prep] be difficult for | 8 |
|
| 2 | [v-ing] [prep] be difficult for | 8 |
|
| 3 | [v-ing] [prep] be difficult for | 8 |
|
| 4 | going [prep] be difficult for | 6 |
|
| 5 | [v-ing] to be difficult for | 6 |
|
| 6 | [v-ing] [prep] be difficult for | 6 |
|
| 7 | [v-ing] to be difficult for | 6 |
|
