SN4 ""

No	Pattern	Freq
1	[be] [adv] difficult to say	33
2	be [adv] difficult to say	33
3	[is] [adv] difficult to say	29
4	is [adv] difficult to say	19
5	's [adv] difficult to say	10
6	[adv] [adv] difficult to say	6
7	[adv] [adv] difficult to say	5
8	[adv] [adv] difficult to say	6
9	[adv] [adv] difficult to say	6
10	[adv] difficult to say [pron]	9
11	[adv] difficult to say [prep]	7
12	[adv] difficult to say [conj]	7
13	[adv] difficult to say [prep]	7
14	[adv] difficult to say [Wh det]	6
15	[adv] difficult to say what	5
16	[adv] difficult to say [adv]	5
17	[adv] difficult to say what	5
18	[adv] difficult to say [subord]	5