| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | in 1990 [be] | 79 |
|
| 2 | in 1990 be | 79 |
|
| 3 | in 1990 [was/were] | 62 |
|
| 4 | in 1990 was | 43 |
|
| 5 | in 1990 were | 19 |
|
| 6 | in 1990 [is] | 12 |
|
| 7 | in 1990 is | 12 |
|
