SN4 ""

No	Pattern	Freq
1	have [verb] how	286
2	have [vb pp] how	229
3	have see how	67
4	have seen how	66
5	have [to-vb] how	57
6	have show how	46
7	have shown how	43
8	have learn how	33
9	have to learn how	17
10	have learned how	12
11	have know how	11
12	have described how	10
13	have decide how	10
14	have to know how	10
15	have describe how	10
16	have forgotten how	9
17	have forget how	9
18	have note how	6
19	have indicate how	6
20	have noted how	6
21	have to decide how	6
22	have ask how	5
23	have indicated how	5
24	have discover how	5
25	have consider how	5