| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] [verb] [prep] [art] | 25394 |
|
| 2 | [been] [v-ing] [prep] [art] | 2210 |
|
| 3 | [be] operating [prep] [art] | 134 |
|
| 4 | [been] operate [prep] [art] | 20 |
|
| 5 | [been] operating [prep] [art] | 18 |
|
