SN4 ""

No	Pattern	Freq
1	[pron] should have been [adv]	117
2	[pers pn] should have been [adv]	103
3	[noun] should have been [adv]	56
4	[noun sg] should have been [adv]	35
5	i should have been [adv]	29
6	i should have been [adv]	29
7	you should have been [adv]	25
8	you should have been [adv]	25
9	it should have been [adv]	18
10	it should have been [adv]	18
11	she should have been [adv]	12
12	she should have been [adv]	11
13	[noun pl] should have been [adv]	11
14	he should have been [adv]	11
15	he should have been [adv]	11
16	[noun prp] should have been [adv]	10
17	[adj] should have been [adv]	9
18	[det] should have been [adv]	9
19	this should have been [adv]	6
20	this should have been [adv]	6
21	[Wh pn] should have been [adv]	5
22	who should have been [adv]	5
23	who should have been [adv]	5
24	[Wh det] should have been [adv]	5
25	should [adv] have been [adv]	33
26	should not have been [adv]	24
27	should [not/n't] have been [adv]	24
28	should n't have been [adv]	18
29	should [adv] have been [adv]	9
30	should never have been [adv]	7