| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] at an | 90 |
|
| 2 | was [vb pp] at an | 49 |
|
| 3 | were [vb pp] at an | 36 |
|
| 4 | is [vb pp] at an | 29 |
|
| 5 | been [vb pp] at an | 23 |
|
| 6 | are [vb pp] at an | 21 |
|
| 7 | being [vb pp] at an | 17 |
|
| 8 | be taken at an | 9 |
|
| 9 | be made at an | 8 |
|
| 10 | be discussed at an | 7 |
|
| 11 | be raised at an | 6 |
|
| 12 | be introduced at an | 5 |
|
| 13 | be held at an | 5 |
|
