SN4 ""

No	Pattern	Freq
1	as if they have been	90
2	[prep] if they have been	90
3	as if they have been	90
4	[prep] if they have been	90
5	[adv] if they have been	57
6	[adv] if they have been	54
7	[noun] if they have been	44
8	[conj] if they have been	41
9	[verb] if they have been	38
10	even if they have been	28
11	even if they have been	28
12	[noun sg] if they have been	26
13	[subord] if they have been	24
14	[adj] if they have been	19
15	[adj] if they have been	17
16	[vb pp] if they have been	16
17	[noun pl] if they have been	15
18	than if they have been	11
19	as if they have been	11
20	as if they have been	11
21	than if they have been	11
22	[coord] if they have been	10
23	[vb infin] if they have been	8
24	and if they have been	8
25	and if they have been	8
26	especially if they have been	7
27	that if they have been	7
28	especially if they have been	7
29	that if they have been	7
30	[that] if they have been	7