| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [verb] at [adj] | 4977 |
|
| 2 | be [v-ing] at [adj] | 842 |
|
| 3 | be operating [prep] [adj] | 69 |
|
| 4 | be operate at [adj] | 20 |
|
| 5 | [be] operating at [adj] | 15 |
|
