SN4 ""

No	Pattern	Freq
1	[adv] difficult be	38
2	[adv] difficult be	28
3	more difficult be	13
4	more difficult be	13
5	how difficult be	8
6	how difficult be	8
7	[Wh adv] difficult be	8
8	be difficult be	5
9	very difficult be	5
10	[be] difficult be	5
11	very difficult be	5
12	difficult [pron] be	165
13	difficult [pers pn] be	162
14	difficult it be	158
15	difficult it be	158
16	difficult [prep] be	133
17	difficult [prep] be	133
18	difficult to be	132
19	difficult to be	132
20	difficult [noun] be	108
21	difficult [noun sg] be	74
22	difficult [verb] be	58
23	difficult [to-vb] be	57
24	difficult [noun pl] be	33
25	difficult [conj] be	12
26	difficult question be	10
27	difficult task be	9
28	difficult question be	8
29	difficult thing be	7
30	difficult [coord] be	7