| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [v-ing] [adv prt] for | 21 |
|
| 2 | it have been [v-ing] on for | 19 |
|
| 3 | it have been [v-ing] on for | 19 |
|
| 4 | it have been going [adv] for | 17 |
|
| 5 | it 's been [v-ing] [adv] for | 17 |
|
