| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [adv prt] [prep] | 817 |
|
| 2 | must [be] [v-ing] [prep] | 161 |
|
| 3 | must [be] [v-ing] [adv prt] | 81 |
|
| 4 | must [be] [adv prt] [prep] | 63 |
|
