| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] to be [v-ing] | 5334 |
|
| 2 | is [verb] to be | 4726 |
|
| 3 | is [verb] to [v-ing] | 249 |
|
| 4 | is to be [v-ing] | 12 |
|
