SN4 ""

No	Pattern	Freq
1	[noun] once [verb] to	72
2	[pron] once [verb] to	71
3	[verb] once [verb] to	50
4	[vb past] once [verb] to	46
5	[pers pn] once [verb] to	46
6	have once [verb] to	44
7	had once [verb] to	42
8	be once [verb] to	38
9	[be] once [verb] to	38
10	[was/were] once [verb] to	36
11	[noun sg] once [verb] to	35
12	[prep] once [verb] to	31
13	[prep] once [verb] to	31
14	at once [verb] to	28
15	at once [verb] to	28
16	[noun prp] once [verb] to	28
17	was once [verb] to	26
18	i once [verb] to	19
19	i once [verb] to	19
20	[adv] once [verb] to	17
21	[conj] once [verb] to	15
22	[adv] once [verb] to	13
23	he once [verb] to	12
24	he once [verb] to	12
25	never once [verb] to	10
26	that once [verb] to	10
27	which once [verb] to	10
28	which once [verb] to	10
29	[Wh det] once [verb] to	10
30	[that] once [verb] to	10