| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [vb pp] [Wh adv] [adj] | 13 |
|
| 2 | should be [vb pp] [Wh adv] possible | 10 |
|
| 3 | should be [vb pp] whenever [adj] | 6 |
|
| 4 | should be [vb pp] wherever [adj] | 5 |
|
| 5 | should be avoided [Wh adv] [adj] | 5 |
|
