| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] to become a member | 18 |
|
| 2 | have become a member | 11 |
|
| 3 | [verb] become a member | 11 |
|
| 4 | [vb -s] become a member | 9 |
|
| 5 | [vb past] become a member | 8 |
|
| 6 | had become a member | 6 |
|
