SN4 ""

No	Pattern	Freq
1	it be [adv] difficult for	166
2	it be [adv] difficult for	166
3	it be [adv] difficult for	155
4	it is [adv] difficult for	78
5	it be very difficult for	61
6	it be very difficult for	61
7	it was [adv] difficult for	49
8	it 's [adv] difficult for	39
9	it be extremely difficult for	13
10	it be more difficult for	13
11	it be more difficult for	13
12	it be extremely difficult for	13
13	it be not difficult for	11
14	it be [not/n't] difficult for	11
15	it be often difficult for	9
16	it be often difficult for	9
17	it be not difficult for	8
18	it be always difficult for	7
19	it be always difficult for	7
20	it be increasingly difficult for	5
21	it be increasingly difficult for	5