| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | five years [pers pn] have be [v-ing] | 5 |
|
| 2 | five years [pers pn] have been [v-ing] | 5 |
|
| 3 | five years [pers pn] have [been] [v-ing] | 5 |
|
