| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] used for [adj] years | 15 |
|
| 2 | been used for [adj] year | 15 |
|
| 3 | [been] used for [det] year | 13 |
|
| 4 | [been] used for many year | 11 |
|
| 5 | [been] used for many year | 11 |
|
