| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | take several years | 36 |
|
| 2 | take several year | 36 |
|
| 3 | take several year | 13 |
|
| 4 | taken several year | 7 |
|
| 5 | take several year | 5 |
|
| 6 | took several year | 5 |
|
