SN4 ""

No	Pattern	Freq
1	be [adv] difficult [conj]	273
2	[be] [adv] difficult [conj]	273
3	[adv] [adv] difficult [conj]	182
4	[adv] [adv] difficult [conj]	148
5	[is] [adv] difficult [conj]	134
6	is [adv] difficult [conj]	118
7	[verb] [adv] difficult [conj]	90
8	[noun] [adv] difficult [conj]	71
9	[art] [adv] difficult [conj]	62
10	[art] [adv] difficult [conj]	62
11	[was/were] [adv] difficult [conj]	57
12	[noun sg] [adv] difficult [conj]	51
13	[be] [adv] difficult [conj]	50
14	be [adv] difficult [conj]	50
15	was [adv] difficult [conj]	49
16	[pron] [adv] difficult [conj]	46
17	[pers pn] [adv] difficult [conj]	41
18	much [adv] difficult [conj]	41
19	much [adv] difficult [conj]	41
20	it [adv] difficult [conj]	40
21	it [adv] difficult [conj]	40
22	the [adv] difficult [conj]	33
23	the [adv] difficult [conj]	33
24	[not/n't] [adv] difficult [conj]	31
25	not [adv] difficult [conj]	31
26	become [adv] difficult [conj]	28
27	[vb pp] [adv] difficult [conj]	24
28	are [adv] difficult [conj]	23
29	a [adv] difficult [conj]	23
30	even [adv] difficult [conj]	23