SN4 ""

No	Pattern	Freq
1	it [adv] difficult [verb]	370
2	it [adv] difficult [to-vb]	366
3	it very difficult [verb]	129
4	it very difficult [verb]	129
5	it more difficult [verb]	72
6	it more difficult [verb]	72
7	it increasingly difficult [verb]	49
8	it increasingly difficult [verb]	49
9	it extremely difficult [verb]	31
10	it extremely difficult [verb]	31
11	it [adv] difficult to get	29
12	it [adv] difficult get	29
13	it so difficult [verb]	20
14	it so difficult [verb]	20
15	it [adv] difficult to understand	12
16	it [adv] difficult understand	12
17	it quite difficult [verb]	11
18	it quite difficult [verb]	11
19	it rather difficult [verb]	9
20	it [adv] difficult find	9
21	it [adv] difficult to make	9
22	it [adv] difficult make	9
23	it rather difficult [verb]	9
24	it [adv] difficult to find	8
25	it too difficult [verb]	7
26	it [adv] difficult to work	7
27	it [adv] difficult work	7
28	it [adv] difficult to keep	7
29	it too difficult [verb]	7
30	it particularly difficult [verb]	7