| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be [v-ing] [adv] | 1208 |
|
| 2 | [modal v] be [v-ing] a | 946 |
|
| 3 | [modal v] be [adv] a | 508 |
|
| 4 | be [v-ing] [adv] a | 288 |
|
