| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [v-ing] [prep] | 8820 |
|
| 2 | [v-ing] [prep] [adv] | 4727 |
|
| 3 | is [v-ing] [adv] | 3029 |
|
| 4 | is [prep] [adv] | 1554 |
|
