SN4 ""

No	Pattern	Freq
1	[pron] [vb mod] be difficult for	81
2	it [vb mod] be difficult for	80
3	it [vb mod] be difficult for	80
4	[pers pn] [vb mod] be difficult for	80
5	[noun] [vb mod] be difficult for	17
6	[noun sg] [vb mod] be difficult for	12
7	[det] [vb mod] be difficult for	5
8	[adj] [vb mod] be difficult for	5
9	[vb mod] [vb infin] be difficult for	20
10	[vb mod] [verb] be difficult for	20
11	[vb mod] have be difficult for	20
12	[vb mod] have be difficult for	20
13	[vb mod] [adv] be difficult for	17
14	[vb mod] [adv] be difficult for	10
15	[vb mod] [not/n't] be difficult for	7
16	[vb mod] not be difficult for	7
17	[vb mod] be [adv] difficult for	69
18	[vb mod] be [adv] difficult for	69
19	[vb mod] be very difficult for	33
20	[vb mod] be very difficult for	33
21	[vb mod] be extremely difficult for	10
22	[vb mod] be extremely difficult for	10
23	[vb mod] be more difficult for	5
24	[vb mod] be more difficult for	5
25	[vb mod] be difficult for [pron]	42
26	[vb mod] be difficult for [pers pn]	36
27	[vb mod] be difficult for [art]	27
28	[vb mod] be difficult for [art]	27
29	[vb mod] be difficult for [noun]	25
30	[vb mod] be difficult for the	17