| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [v-ing] [to-vb] | 4418 |
|
| 2 | [det] is [to-vb] | 1395 |
|
| 3 | [det] is [v-ing] | 1108 |
|
| 4 | [det] [v-ing] [to-vb] | 529 |
|
