| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which had been [v-ing] [adv] | 36 |
|
| 2 | which had been [v-ing] [adv prt] | 19 |
|
| 3 | which had been [v-ing] [adv] | 17 |
|
| 4 | which had been going [adv] | 11 |
|
| 5 | which had been [v-ing] on | 10 |
|
| 6 | which had been [v-ing] on | 10 |
|
| 7 | which had been [v-ing] up | 9 |
|
| 8 | which had been [v-ing] up | 9 |
|
| 9 | which had been building [adv] | 6 |
|
