| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] investigate at the time | 6 |
|
| 2 | [be] [adv] investigate at the time | 6 |
|
| 3 | [was/were] [adv] investigate at the time | 5 |
|
| 4 | was [adv] investigate at the time | 5 |
|
| 5 | [adv] investigate at the time [prep] | 5 |
|
| 6 | [adv] investigate at the time [prep] | 5 |
|
| 7 | [adv] investigate at the time of | 5 |
|
| 8 | [adv] investigate at the time of | 5 |
|
