No | Pattern | Freq | Relations |
---|---|---|---|
1 | [verb] been used [prep] years | 8 | |
2 | have been used [prep] years | 8 | |
3 | been used [prep] [adj] years | 21 | |
4 | been used [prep] [det] years | 14 | |
5 | been used [prep] many years | 12 | |
6 | been used [prep] many years | 12 | |
7 | been used [prep] [adj] years | 5 |