SN4 ""

No	Pattern	Freq
1	[adv] difficult is	23
2	[adv] difficult is	17
3	more difficult is	11
4	more difficult is	11
5	[Wh adv] difficult is	6
6	how difficult is	6
7	how difficult is	6
8	difficult [pron] is	116
9	difficult [pers pn] is	113
10	difficult it is	111
11	difficult it is	111
12	difficult [noun] is	60
13	difficult [noun sg] is	48
14	difficult [verb] is	39
15	difficult [to-vb] is	39
16	difficult [noun pl] is	12
17	difficult question is	8
18	difficult question is	8
19	difficult task is	7
20	difficult thing is	5
21	difficult is [adv]	12
22	difficult is [verb]	10
23	difficult is n't	9
24	difficult is not	9
25	difficult is [not/n't]	9
26	difficult is it	7
27	difficult is [pron]	7
28	difficult is it	7
29	difficult is [pers pn]	7
30	difficult is [art]	6