| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [verb] for [adj] year | 345 |
|
| 2 | been [vb pp] for [adj] year | 198 |
|
| 3 | been used for [adj] [noun] | 59 |
|
| 4 | been used [prep] [adj] year | 21 |
|
| 5 | be used for [adj] year | 17 |
|
| 6 | [be] used for [adj] year | 17 |
|
| 7 | been use for [adj] year | 16 |
|
| 8 | [been] used for [adj] year | 15 |
|
