SN4 ""

No	Pattern	Freq
1	[pron] had once	591
2	[noun] had once	346
3	[pers pn] had once	338
4	[noun prp] had once	156
5	[noun sg] had once	148
6	he had once	141
7	he had once	141
8	[Wh det] had once	139
9	[conj] had once	113
10	that had once	95
11	that had once	95
12	[that] had once	95
13	[Wh pn] had once	94
14	who had once	93
15	who had once	93
16	she had once	84
17	she had once	84
18	which had once	80
19	which had once	80
20	what had once	59
21	what had once	59
22	it had once	46
23	it had once	46
24	[noun pl] had once	38
25	they had once	35
26	they had once	30
27	i had once	25
28	i had once	25
29	[coord] had once	16
30	and had once	13