| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [vb pp] is | 691 |
|
| 2 | is [v-ing] is | 204 |
|
| 3 | is need is | 121 |
|
| 4 | is needed is | 121 |
|
| 5 | is require is | 87 |
|
| 6 | is required is | 87 |
|
| 7 | is say is | 52 |
|
| 8 | is do is | 52 |
|
| 9 | is doing is | 32 |
|
| 10 | is saying is | 30 |
|
| 11 | is happening is | 29 |
|
| 12 | is happen is | 29 |
|
| 13 | is leave is | 23 |
|
| 14 | is left is | 23 |
|
| 15 | is done is | 19 |
|
| 16 | is based is | 17 |
|
| 17 | is base is | 17 |
|
| 18 | is know is | 16 |
|
| 19 | is known is | 16 |
|
| 20 | is said is | 15 |
|
| 21 | is seek is | 13 |
|
| 22 | is make is | 13 |
|
| 23 | is offer is | 11 |
|
| 24 | is [to-vb] is | 11 |
|
| 25 | is use is | 11 |
|
| 26 | is involved is | 11 |
|
| 27 | is involve is | 11 |
|
| 28 | is used is | 11 |
|
| 29 | is propose is | 10 |
|
| 30 | is sought is | 9 |
|
