| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] been [v-ing] for [det] [noun pl] | 33 |
|
| 2 | had [been] [v-ing] for [det] [noun pl] | 32 |
|
| 3 | [vb past] [been] [v-ing] for [det] years | 20 |
|
| 4 | [vb past] [been] [v-ing] for some [noun pl] | 12 |
|
| 5 | [vb past] [been] [v-ing] for several [noun pl] | 11 |
|
| 6 | [vb past] [been] [v-ing] for many [noun pl] | 8 |
|
