SN4 ""

No	Pattern	Freq
1	[conj] he had once	41
2	[noun] he had once	40
3	[noun sg] he had once	32
4	that he had once	20
5	[that] he had once	20
6	that he had once	20
7	[subord] he had once	18
8	[pron] he had once	16
9	[adv] he had once	11
10	[Wh det] he had once	10
11	as he had once	9
12	as he had once	9
13	[Wh adv] he had once	8
14	how he had once	7
15	how he had once	7
16	which he had once	7
17	which he had once	7
18	[noun pl] he had once	5
19	he had [vb pp] once	14
20	he had [verb] once	14
21	he had once [verb]	104
22	he had once [vb pp]	103
23	he had once [be]	25
24	he had once been	25
25	he had once be	25
26	he had once [been]	25
27	he had once [adv]	8
28	he had once [adv]	8
29	he had once say	7
30	he had once said	7