| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [been] [v-ing] [prep] two year | 6 |
|
| 2 | [vb past] [be] [v-ing] [prep] two years | 6 |
|
| 3 | [vb past] been [v-ing] [prep] two year | 6 |
|
| 4 | had [be] [v-ing] [prep] two year | 6 |
|
| 5 | [vb past] be [v-ing] [prep] two year | 6 |
|
| 6 | [vb past] [be] [v-ing] for two year | 6 |
|
