| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [vb pp] [prep] [adj] | 1811 |
|
| 2 | be [vb pp] [prep] an [adj] | 1268 |
|
| 3 | should be [vb pp] [prep] an | 217 |
|
| 4 | should be [prep] an [adj] | 8 |
|
| 5 | should be [vb pp] an [adj] | 6 |
|
