| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] [verb] [prep] a | 1853 |
|
| 2 | has [been] [v-ing] [prep] a | 94 |
|
| 3 | [verb] [been] working [prep] a | 60 |
|
| 4 | have [been] working [prep] a | 60 |
|
| 5 | has [been] working [prep] [art] | 34 |
|
| 6 | has [been] working [prep] [art] | 34 |
|
| 7 | has [been] working [prep] a | 15 |
|
| 8 | [vb -s] [been] working [prep] a | 15 |
|
| 9 | has [been] work [prep] a | 13 |
|
| 10 | has [be] working [prep] a | 12 |
|
