SN4 ""

No	Pattern	Freq
1	[modal v] have known	666
2	[vb mod] have known	666
3	[adv] have known	220
4	should have known	202
5	should have known	202
6	must have known	194
7	must have known	194
8	would have known	151
9	[not/n't] have known	145
10	not have known	145
11	would have known	107
12	might have known	75
13	[adv] have known	75
14	might have known	75
15	n't have known	74
16	not have known	71
17	'd have known	44
18	[pron] have known	32
19	[pers pn] have known	32
20	could have known	30
21	could have known	30
22	never have known	27
23	never have known	27
24	may have known	13
25	may have known	13
26	i have known	10
27	i have known	10
28	possibly have known	10
29	possibly have known	10
30	she have known	7