| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] [prep] [pron] [to-vb] | 329 |
|
| 2 | is [adj] [prep] [pron] [to-vb] | 303 |
|
| 3 | is [adv] [prep] [pron] [to-vb] | 137 |
|
| 4 | is not [prep] [pron] [to-vb] | 52 |
|
| 5 | is [adv prt] [prep] [pron] [to-vb] | 52 |
|
| 6 | is [not/n't] [prep] [pron] [to-vb] | 52 |
|
| 7 | is up [prep] [pron] [to-vb] | 51 |
|
| 8 | is up [prep] [pron] [to-vb] | 51 |
|
| 9 | is not [prep] [pron] [to-vb] | 49 |
|
| 10 | is [verb] [prep] [pron] [to-vb] | 47 |
|
| 11 | is difficult [prep] [pron] [to-vb] | 43 |
|
| 12 | is difficult [prep] [pron] [to-vb] | 43 |
|
| 13 | is important [prep] [pron] [to-vb] | 33 |
|
| 14 | is [adv] [prep] [pron] [to-vb] | 33 |
|
| 15 | is important [prep] [pron] [to-vb] | 33 |
|
| 16 | is necessary [prep] [pron] [to-vb] | 29 |
|
| 17 | is necessary [prep] [pron] [to-vb] | 29 |
|
| 18 | is [v-ing] [prep] [pron] [to-vb] | 27 |
|
| 19 | is impossible [prep] [pron] [to-vb] | 24 |
|
| 20 | is impossible [prep] [pron] [to-vb] | 24 |
|
| 21 | is easy [prep] [pron] [to-vb] | 23 |
|
| 22 | is [pron] [prep] [pron] [to-vb] | 22 |
|
| 23 | is possible [prep] [pron] [to-vb] | 19 |
|
| 24 | is possible [prep] [pron] [to-vb] | 19 |
|
| 25 | is [adj -er] [prep] [pron] [to-vb] | 19 |
|
| 26 | is [vb pp] [prep] [pron] [to-vb] | 18 |
|
| 27 | is [noun] [prep] [pron] [to-vb] | 18 |
|
| 28 | is [noun sg] [prep] [pron] [to-vb] | 16 |
|
| 29 | is [indef pn] [prep] [pron] [to-vb] | 12 |
|
| 30 | is easy [prep] [pron] [to-vb] | 11 |
|
