| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [adv] [verb] at [art] time | 74 |
|
| 2 | [be] [adv] investigate at [art] [noun] | 7 |
|
| 3 | [be] [adv] investigate at [art] [noun sg] | 7 |
|
| 4 | [be] [adv] investigate [prep] [art] time | 6 |
|
| 5 | [be] [adv] investigate at [art] time | 6 |
|
| 6 | [be] [adv] investigate at [art] time | 6 |
|
| 7 | [be] [adv] investigate [prep] [art] time | 6 |
|
| 8 | [be] [adv] investigate at [art] time | 6 |
|
| 9 | [be] [adv] investigate at [art] time | 6 |
|
