| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [v-ing] [prep] | 341 |
|
| 2 | not be [v-ing] [prep] | 191 |
|
| 3 | should not be [v-ing] | 71 |
|
| 4 | should not be [prep] | 67 |
|
