| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could be [verb] for | 23 |
|
| 2 | they could be [verb] for | 23 |
|
| 3 | they could be [vb pp] for | 18 |
|
| 4 | they could be used for | 6 |
|
| 5 | they could be use for | 6 |
|
| 6 | they could be [v-ing] for | 5 |
|
