| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which had been [v-ing] | 162 |
|
| 2 | which has been [v-ing] | 154 |
|
| 3 | which have been [v-ing] | 45 |
|
| 4 | which have been going | 30 |
|
| 5 | which have been running | 18 |
|
| 6 | which have been working | 12 |
|
| 7 | which have been building | 9 |
|
| 8 | which have been operating | 9 |
|
| 9 | which have been making | 7 |
|
| 10 | which have been looking | 6 |
|
| 11 | which have been taking | 6 |
|
| 12 | which have been growing | 6 |
|
| 13 | which have been lying | 5 |
|
| 14 | which have been developing | 5 |
|
