SN4 ""

No	Pattern	Freq
1	it have [verb] to	874
2	it have [vb pp] to	848
3	it 's [verb] to	393
4	it have get to	300
5	it have got to	299
6	it had [verb] to	245
7	it has [verb] to	224
8	it have come to	90
9	it have come to	85
10	it have happen to	34
11	it have happened to	33
12	it have go to	32
13	it have lead to	32
14	it have led to	32
15	it have gone to	29
16	it have occurred to	28
17	it have occur to	28
18	it have [to-vb] to	24
19	it have prove to	23
20	it have proved to	23
21	it have seem to	22
22	it have seemed to	21
23	it have fall to	16
24	it have fallen to	16
25	it have rise to	15
26	it have risen to	15
27	it have relate to	11
28	it have related to	11
29	it have grown to	10
30	it have do to	10