SN4 ""

No	Pattern	Freq
1	[vb past] once	1847
2	have once	1304
3	had once	1105
4	[vb pp] once	728
5	[vb base] once	342
6	[v-ing] once	262
7	[to-vb] once	213
8	[vb infin] once	204
9	[vb -s] once	201
10	do once	100
11	say once	65
12	meet once	60
13	remember once	56
14	has once	56
15	did once	53
16	remember once	47
17	having once	43
18	'd once	42
19	said once	40
20	happen once	38
21	come once	36
22	go once	36
23	turn once	33
24	see once	32
25	try once	31
26	done once	30
27	look once	28
28	have once	28
29	prove once	26
30	use once	25