| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of [noun pl] has been [vb pp] | 155 |
|
| 2 | of [noun pl] has been [v-ing] | 13 |
|
| 3 | of [noun pl] has been developed | 7 |
|
| 4 | of [noun pl] has been develop | 7 |
|
