| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] used for [adj] year | 12 |
|
| 2 | [verb] been used for [adj] year | 12 |
|
| 3 | [verb] [been] used for [det] year | 12 |
|
| 4 | [verb] [been] used for [adj] years | 12 |
|
| 5 | [verb] [been] used for many year | 11 |
|
| 6 | [verb] [been] used for many year | 11 |
|
| 7 | has [been] used for [adj] year | 7 |
|
| 8 | [vb -s] [been] used for [adj] year | 7 |
|
