| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [vb base] been used [prep] | 16 |
|
| 2 | they [vb base] [been] used [prep] | 14 |
|
| 3 | they have [been] used [prep] | 11 |
|
| 4 | they [vb base] [been] used in | 5 |
|
| 5 | they 've [been] used [prep] | 5 |
|
