| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [n mass] has [been] [vb pp] [prep] a | 19 |
|
| 2 | [n mass] has been [verb] [prep] a | 19 |
|
| 3 | [n mass] has [been] [verb] from a | 7 |
|
| 4 | [n mass] has [been] [verb] in a | 5 |
|
