SN4 ""

No	Pattern	Freq
1	[noun] [vb past] it difficult	140
2	[pron] [vb past] it difficult	123
3	[pers pn] [vb past] it difficult	103
4	[noun sg] [vb past] it difficult	53
5	[noun pl] [vb past] it difficult	47
6	he [vb past] it difficult	40
7	[adv] [vb past] it difficult	40
8	he [vb past] it difficult	40
9	[adv] [vb past] it difficult	39
10	[conj] [vb past] it difficult	36
11	[noun prp] [vb past] it difficult	35
12	[coord] [vb past] it difficult	31
13	i [vb past] it difficult	23
14	i [vb past] it difficult	23
15	and [vb past] it difficult	21
16	and [vb past] it difficult	21
17	she [vb past] it difficult	19
18	she [vb past] it difficult	19
19	they [vb past] it difficult	12
20	[Wh det] [vb past] it difficult	11
21	[adj] [vb past] it difficult	11
22	they [vb past] it difficult	11
23	which [vb past] it difficult	10
24	which [vb past] it difficult	10
25	but [vb past] it difficult	9
26	still [vb past] it difficult	9
27	still [vb past] it difficult	9
28	but [vb past] it difficult	9
29	[Wh pn] [vb past] it difficult	8
30	who [vb past] it difficult	8