| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] used [prep] a | 841 |
|
| 2 | [be] [verb] at a | 571 |
|
| 3 | [be] [vb pp] at a | 518 |
|
| 4 | [be] used at [art] | 32 |
|
| 5 | [be] used at [art] | 32 |
|
| 6 | [be] used at a | 24 |
|
| 7 | [be] used at a | 10 |
|
| 8 | [be] use at a | 9 |
|
