| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have been [v-ing] for [num] | 10 |
|
| 2 | which have [been] [v-ing] for [num] | 10 |
|
| 3 | which has [been] [v-ing] for [num] | 7 |
|
| 4 | which have [been] running for [num] | 6 |
|
