SN4 ""

No	Pattern	Freq
1	[verb] how difficult it be	58
2	[vb base] how difficult it be	15
3	[vb past] how difficult it be	14
4	[prep] how difficult it be	14
5	[prep] how difficult it be	14
6	know how difficult it be	12
7	know how difficult it be	9
8	[to-vb] how difficult it be	8
9	and how difficult it be	7
10	[conj] how difficult it be	7
11	[coord] how difficult it be	7
12	and how difficult it be	7
13	[adv] how difficult it be	7
14	[adj] how difficult it be	6
15	[vb -s] how difficult it be	6
16	[v-ing] how difficult it be	6
17	about how difficult it be	6
18	about how difficult it be	6
19	[adj] how difficult it be	6
20	of how difficult it be	5
21	of how difficult it be	5
22	explain how difficult it be	5
23	[vb pp] how difficult it be	5
24	[pron] how difficult it be	5
25	how [adv] difficult it be	5
26	how [adv] difficult it be	5
27	how difficult it [modal v] be	25
28	how difficult it [vb mod] be	25
29	how difficult it would be	9
30	how difficult it can be	9