SN4 ""

No	Pattern	Freq
1	[vb mod] have be difficult	75
2	[modal v] have be difficult	75
3	would have be difficult	58
4	would have be difficult	58
5	[pron] have be difficult	54
6	[pers pn] have be difficult	51
7	it have be difficult	48
8	it have be difficult	48
9	[noun] have be difficult	41
10	[noun sg] have be difficult	25
11	[noun pl] have be difficult	12
12	must have be difficult	12
13	must have be difficult	12
14	[adv] have be difficult	5
15	have [adv] be difficult	26
16	have [adv] be difficult	21
17	have always be difficult	14
18	have always be difficult	14
19	have not be difficult	5
20	have [not/n't] be difficult	5
21	have be [adv] difficult	82
22	have be [adv] difficult	82
23	have be very difficult	38
24	have be very difficult	38
25	have be a difficult	32
26	have be [art] difficult	32
27	have be a difficult	32
28	have be [art] difficult	32
29	have be more difficult	10
30	have be more difficult	10