| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be customary for [noun pl] [to-vb] | 7 |
|
| 2 | it be customary for [noun pl] [to-vb] | 7 |
|
| 3 | it be customary [prep] [noun pl] [to-vb] | 7 |
|
| 4 | it is customary [prep] [noun pl] [to-vb] | 5 |
|
