| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] [prep] | 70803 |
|
| 2 | [v-ing] [vb pp] [prep] | 2607 |
|
| 3 | [v-ing] is [vb pp] | 245 |
|
| 4 | [v-ing] is [prep] | 136 |
|
