SN4 ""

No	Pattern	Freq
1	difficult [conj] it is	24
2	difficult [subord] it is	20
3	difficult because it is	8
4	difficult because it is	8
5	difficult as it is	6
6	difficult as it is	6
7	[adv] difficult it is	104
8	[Wh adv] difficult it is	79
9	how difficult it is	77
10	how difficult it is	77
11	[adv] difficult it is	25
12	more difficult it is	23
13	more difficult it is	23
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 [adv]	6
24	difficult it is [v-ing]	6