| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | system be to [be] | 45 |
|
| 2 | system be [prep] be | 45 |
|
| 3 | system be [prep] [be] | 40 |
|
| 4 | system is [prep] [be] | 25 |
|
| 5 | system was [prep] [be] | 11 |
|
| 6 | systems be [prep] [be] | 5 |
|
| 7 | system are [prep] [be] | 5 |
|
