| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be at a | 1033 |
|
| 2 | [was/were] at a | 386 |
|
| 3 | was at a | 291 |
|
| 4 | [is] at a | 247 |
|
| 5 | is at a | 215 |
|
| 6 | [am/are] at a | 163 |
|
| 7 | be at a | 162 |
|
| 8 | [be] at a | 162 |
|
| 9 | are at a | 108 |
|
| 10 | were at a | 95 |
|
| 11 | [been] at a | 49 |
|
| 12 | been at a | 49 |
|
| 13 | 's at a | 32 |
|
| 14 | being at a | 26 |
|
| 15 | 're at a | 26 |
|
| 16 | [being] at a | 26 |
|
| 17 | 'm at a | 15 |
|
| 18 | am at a | 14 |
|
