| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [prep] be a | 1319 |
|
| 2 | [vb past] [prep] be [prep] | 1068 |
|
| 3 | [prep] be [prep] a | 745 |
|
| 4 | [vb past] [prep] [prep] a | 129 |
|
