| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [prep] 30 year | 10 |
|
| 2 | [v-ing] [prep] 30 year | 10 |
|
| 3 | [v-ing] for 30 year | 7 |
|
| 4 | [v-ing] for 30 year | 7 |
|
| 5 | [v-ing] 30 year [prep] | 6 |
|
| 6 | [v-ing] 30 year [prep] | 6 |
|
