| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [vb pp] in the 1960s | 9 |
|
| 2 | had done in the [num] | 8 |
|
| 3 | had [vb pp] in the 1930s | 7 |
|
| 4 | had [vb pp] in the 1980s | 5 |
|
| 5 | had [vb pp] in the 1950s | 5 |
|
