| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [been] observe [prep] | 41 |
|
| 2 | [vb base] also [been] [prep] | 26 |
|
| 3 | also [been] observe [prep] | 12 |
|
| 4 | [vb base] also [been] observe | 9 |
|
