| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have be [v-ing] [prep] | 80 |
|
| 2 | must have be [prep] [adj] | 51 |
|
| 3 | have be [v-ing] [prep] [adj] | 39 |
|
| 4 | must be [v-ing] [prep] [adj] | 27 |
|
| 5 | must have be [v-ing] [adj] | 21 |
|
