SN4 ""

No	Pattern	Freq
1	[pron] had once been	229
2	[Wh det] had once been	95
3	[pers pn] had once been	89
4	[noun] had once been	66
5	[conj] had once been	55
6	what had once been	55
7	what had once been	55
8	[that] had once been	49
9	that had once been	49
10	that had once been	49
11	which had once been	40
12	which had once been	40
13	[noun sg] had once been	39
14	who had once been	34
15	[Wh pn] had once been	34
16	who had once been	34
17	it had once been	33
18	it had once been	33
19	he had once been	25
20	he had once been	25
21	she had once been	20
22	she had once been	20
23	[noun pl] had once been	13
24	[noun prp] had once been	12
25	they had once been	10
26	there had once been	9
27	[ex0] had once been	9
28	there had once been	9
29	they had once been	8
30	had [adv] once been	8