| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] during the 1980s | 51 |
|
| 2 | [vb pp] during the 1980s | 37 |
|
| 3 | [vb past] during the 1980s | 8 |
|
| 4 | increase during the 1980s | 5 |
|
