SN4 ""

No	Pattern	Freq
1	[adv] difficult it is	104
2	[Wh adv] difficult it is	79
3	how difficult it is	77
4	how difficult it is	77
5	[adv] difficult it is	25
6	more difficult it is	23
7	more difficult it is	23
8	difficult [conj] it is	24
9	difficult [subord] it is	20
10	difficult because it is	8
11	difficult because it is	8
12	difficult as it is	6
13	difficult as it is	6
14	difficult it is [verb]	69
15	difficult it is [to-vb]	63
16	difficult it is [prep]	26
17	difficult it is [prep]	26
18	difficult it is for	22
19	difficult it is for	22
20	difficult it is to get	10
21	difficult it is get	10
22	difficult it is [adv]	6
23	difficult it is [v-ing]	6
24	difficult it is [adv]	6