SN4 ""

No	Pattern	Freq
1	[verb] how difficult	108
2	[vb base] how difficult	29
3	[prep] how difficult	27
4	[prep] how difficult	27
5	[vb past] how difficult	27
6	know how difficult	26
7	[adv] how difficult	25
8	[coord] how difficult	22
9	[conj] how difficult	22
10	[adv] how difficult	20
11	know how difficult	17
12	and how difficult	16
13	and how difficult	16
14	[to-vb] how difficult	15
15	just how difficult	12
16	[vb -s] how difficult	12
17	just how difficult	12
18	of how difficult	11
19	show how difficult	11
20	of how difficult	11
21	[noun] how difficult	10
22	about how difficult	9
23	[vb infin] how difficult	9
24	[v-ing] how difficult	9
25	about how difficult	9
26	[adj] how difficult	8
27	[adj] how difficult	8
28	[vb pp] how difficult	7
29	[pron] how difficult	7
30	[noun sg] how difficult	7