| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] be [v-ing] for [det] years | 9 |
|
| 2 | [vb base] been [v-ing] for [det] year | 9 |
|
| 3 | have be [v-ing] for [det] year | 7 |
|
| 4 | [vb base] be [v-ing] for several year | 6 |
|
