| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have often been [prep] | 16 |
|
| 2 | have often [been] [prep] | 16 |
|
| 3 | have often be [prep] | 16 |
|
| 4 | have often [be] in | 7 |
|
| 5 | has often [be] [prep] | 6 |
|
| 6 | had often [be] [prep] | 5 |
|
| 7 | have often [be] at | 5 |
|
