SN4 ""

No	Pattern	Freq
1	[noun] as they have been	30
2	[adj] as they have been	28
3	[adj] as they have been	18
4	[noun sg] as they have been	17
5	[verb] as they have been	16
6	[adv] as they have been	15
7	[adv] as they have been	14
8	[noun pl] as they have been	11
9	[vb pp] as they have been	11
10	[det] as they have been	6
11	as [subord] they have been	37
12	as [conj] they have been	37
13	as though they have been	26
14	as though they have been	26
15	as if they have been	11
16	as if they have been	11
17	as they [vb mod] have been	30
18	as they [modal v] have been	30
19	as they would have been	7
20	as they might have been	7
21	as they should have been	7
22	as they should have been	7
23	as they would have been	7
24	as they might have been	7
25	as they always have been	5
26	as they always have been	5
27	as they [adv] have been	5
28	as they [adv] have been	5
29	as they have [adv] been	36
30	as they have [adv] been	30