| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | system [be] to [be] | 40 |
|
| 2 | system [be] [prep] [be] | 40 |
|
| 3 | system [be] [prep] be | 40 |
|
| 4 | system [be] to [be] | 40 |
|
| 5 | system be [prep] [be] | 40 |
|
| 6 | system [is] [prep] [be] | 24 |
|
| 7 | system is [prep] [be] | 24 |
|
| 8 | system [was/were] [prep] [be] | 15 |
|
| 9 | system was [prep] [be] | 11 |
|
