| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] three years [pers pn] have be | 6 |
|
| 2 | [prep] three years [pers pn] have [be] | 6 |
|
| 3 | [prep] three years [pers pn] have been | 6 |
|
| 4 | [prep] three years [pers pn] have [been] | 6 |
|
| 5 | for three years [pers pn] have [be] | 6 |
|
