| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [be] used for | 60 |
|
| 2 | which be used for | 60 |
|
| 3 | which [is] used for | 27 |
|
| 4 | which is used for | 27 |
|
| 5 | which [was/were] used for | 21 |
|
| 6 | which are used for | 12 |
|
| 7 | which [am/are] used for | 12 |
|
| 8 | which were used for | 11 |
|
| 9 | which was used for | 10 |
|
