SN4 ""

No	Pattern	Freq
1	[noun] are more difficult [to-vb]	33
2	[noun pl] are more difficult [to-vb]	24
3	[pron] are more difficult [to-vb]	10
4	[noun sg] are more difficult [to-vb]	9
5	[pers pn] are more difficult [to-vb]	7
6	they are more difficult [to-vb]	6
7	they are more difficult [to-vb]	6
8	[adj] are more difficult [to-vb]	5
9	are [adv] more difficult [to-vb]	34
10	are [adv] more difficult [to-vb]	34
11	are much more difficult [to-vb]	16
12	are much more difficult [to-vb]	16
13	are more difficult [to-vb] [conj]	22
14	are more difficult [to-vb] [subord]	13
15	are more difficult [to-vb] [coord]	9
16	are more difficult [to-vb] than	9
17	are more difficult [to-vb] [prep]	9
18	are more difficult [to-vb] [prep]	9
19	are more difficult [to-vb] than	9
20	are more difficult [to-vb] and	8
21	are more difficult [to-vb] and	8