SN4 ""

No	Pattern	Freq
1	[pron] would have [been] difficult	38
2	[pers pn] would have [been] difficult	37
3	it would have [been] difficult	37
4	it would have [been] difficult	37
5	[noun] would have [been] difficult	11
6	[noun sg] would have [been] difficult	8
7	[det] would have [been] difficult	6
8	[adj] would have [been] difficult	6
9	would have [been] [adv] difficult	26
10	would have [been] [adv] difficult	26
11	would have [been] very difficult	16
12	would have [been] very difficult	16
13	would have [been] difficult [verb]	26
14	would have [been] difficult [to-vb]	26
15	would have [been] difficult [prep]	16
16	would have [been] difficult [prep]	16
17	would have [been] difficult for	14
18	would have [been] difficult for	14
19	would have [been] difficult [adv]	7
20	would have [been] difficult [adv]	5