| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] to the trouble of [v-ing] | 7 |
|
| 2 | [to-vb] [prep] the trouble of [v-ing] | 7 |
|
| 3 | to go [prep] the trouble of [v-ing] | 7 |
|
| 4 | [to-vb] to the trouble of [v-ing] | 7 |
|
