| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [verb] [been] [verb] for | 2525 |
|
| 2 | [noun] [verb] [been] [v-ing] for | 456 |
|
| 3 | [noun] [verb] [been] operating [prep] | 21 |
|
| 4 | [noun] [verb] [been] operating [prep] | 21 |
|
| 5 | [noun] [verb] [been] operate for | 8 |
|
| 6 | [noun] [verb] [be] operating for | 8 |
|
| 7 | [noun] [verb] [been] operating for | 8 |
|
