SN4 ""

No	Pattern	Freq
1	have [adv] [vb pp] how	183
2	have [adv] [vb pp] how	83
3	have already [vb pp] how	62
4	had [adv] [vb pp] how	41
5	have [adv] seen how	39
6	've [adv] [vb pp] how	25
7	has [adv] [vb pp] how	23
8	have never [vb pp] how	18
9	have also [vb pp] how	13
10	have [adv] forgotten how	13
11	have just [vb pp] how	12
12	have always [vb pp] how	11
13	have often [vb pp] how	11
14	have [adv] explained how	10
15	'd [adv] [vb pp] how	10
16	have [adv] known how	9
17	have [adv] wondered how	8
18	have [adv] noted how	8
19	have [adv] shown how	8
20	have [adv] learned how	8
21	have [adv] said how	6
22	have [adv] noticed how	6
23	have [adv] discovered how	5
24	have [adv] discussed how	5