SN4 ""

No	Pattern	Freq
1	[conj] it is often difficult [verb]	22
2	that it is often difficult [verb]	9
3	[that] it is often difficult [verb]	9
4	[coord] it is often difficult [verb]	9
5	that it is often difficult [verb]	9
6	[noun] it is often difficult [verb]	5
7	and it is often difficult [verb]	5
8	and it is often difficult [verb]	5
9	it is often [adv] difficult [verb]	11
10	it is often [adv] difficult [verb]	10
11	it is often very difficult [verb]	7
12	it is often very difficult [verb]	7
13	it is often difficult [verb] [art]	18
14	it is often difficult [verb] [art]	18
15	it is often difficult [verb] the	13
16	it is often difficult [verb] the	13
17	it is often difficult [verb] [adj]	10
18	it is often difficult [verb] [prep]	10
19	it is often difficult [verb] [prep]	10
20	it is often difficult [verb] [adv]	7
21	it is often difficult [verb] [det]	5
22	it is often difficult [verb] [adj]	5