| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [vb base] [been] observe [prep] | 28 |
|
| 2 | [vb base] also [been] observe [prep] | 7 |
|
| 3 | [noun] [vb base] also [been] observe | 7 |
|
| 4 | [noun] [vb base] also [been] [prep] | 6 |
|
