SN4 ""

No	Pattern	Freq
1	it be [art] difficult [noun]	109
2	it be [art] difficult [noun]	109
3	it be a difficult [noun]	108
4	it be a difficult [noun]	108
5	it be [adv] difficult [noun]	8
6	it be [adv] difficult [noun]	7
7	it be very difficult [noun]	5
8	it be very difficult [noun]	5
9	it be difficult [verb] [noun]	169
10	it be difficult [to-vb] [noun]	169
11	it be difficult [prep] [noun]	56
12	it be difficult [prep] [noun]	56
13	it be difficult for [noun]	47
14	it be difficult for [noun]	47
15	it be difficult get [noun]	14
16	it be difficult find [noun]	14
17	it be difficult to find [noun]	14
18	it be difficult to get [noun]	14
19	it be difficult to make [noun]	8
20	it be difficult make [noun]	8
21	it be difficult keep [noun]	7
22	it be difficult to keep [noun]	7