| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [prep] operation for | 20 |
|
| 2 | [verb] [been] [prep] operation for | 20 |
|
| 3 | has [been] [prep] operation for | 13 |
|
| 4 | [vb -s] [been] [prep] operation for | 13 |
|
| 5 | had [been] [prep] operation for | 5 |
|
| 6 | [vb past] [been] [prep] operation for | 5 |
|
| 7 | [been] [prep] operation for [adj] | 17 |
|
| 8 | [been] [prep] operation for [num] | 10 |
|
| 9 | [been] [prep] operation for [det] | 7 |
|
| 10 | [been] [prep] operation for some | 5 |
|
| 11 | [been] [prep] operation for some | 5 |
|
