| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | having been [vb pp] to | 108 |
|
| 2 | having been [verb] to | 108 |
|
| 3 | [verb] been introduced to | 60 |
|
| 4 | have been introduced to | 60 |
|
| 5 | having been introduced [prep] | 12 |
|
| 6 | having been introduced [prep] | 12 |
|
| 7 | having [be] introduced to | 5 |
|
| 8 | having been introduced to | 5 |
|
| 9 | having been introduce to | 5 |
|
| 10 | having [been] introduced to | 5 |
|
| 11 | [v-ing] been introduced to | 5 |
|
| 12 | having be introduced to | 5 |
|
