| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] be [verb] [adv] a | 31 |
|
| 2 | to be [verb] [adv] a | 31 |
|
| 3 | [prep] be [vb pp] [adv] a | 24 |
|
| 4 | [prep] be [v-ing] [adv] a | 9 |
|
| 5 | [prep] be [verb] once a | 7 |
|
