| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | were [vb pp] on a | 287 |
|
| 2 | were [vb pp] on a | 252 |
|
| 3 | were [vb pp] on an | 35 |
|
| 4 | were based on a | 32 |
|
| 5 | were put on a | 7 |
|
| 6 | were made on a | 7 |
|
| 7 | were employed on a | 7 |
|
| 8 | were placed on a | 7 |
|
| 9 | were run on a | 6 |
|
| 10 | were tested on a | 5 |
|
| 11 | were built on a | 5 |
|
| 12 | were done on a | 5 |
|
