| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [v-ing] [prep] | 161 |
|
| 2 | he must be [v-ing] | 111 |
|
| 3 | he must be [prep] | 34 |
|
| 4 | he be [v-ing] [prep] | 11 |
|
