| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [verb] [been] [v-ing] for | 892 |
|
| 2 | [pron] must [verb] [been] [v-ing] | 186 |
|
| 3 | must [verb] [been] [v-ing] for | 18 |
|
| 4 | [pron] must [verb] [been] for | 8 |
|
