SN4 ""

No	Pattern	Freq
1	[noun] once it [be]	47
2	[conj] once it [be]	43
3	[noun sg] once it [be]	42
4	[coord] once it [be]	26
5	but once it [be]	14
6	but once it [be]	14
7	[verb] once it [be]	13
8	and once it [be]	12
9	and once it [be]	12
10	[subord] once it [be]	10
11	[adv] once it [be]	10
12	[adj] once it [be]	9
13	[adv] once it [be]	8
14	[adj] once it [be]	7
15	[that] once it [be]	7
16	that once it [be]	7
17	that once it [be]	7
18	[vb pp] once it [be]	6
19	[pers pn] once it [be]	5
20	[pron] once it [be]	5
21	once [vb pp] it [be]	5
22	once [verb] it [be]	5
23	once it [verb] [be]	113
24	once it have [be]	112
25	once it [vb -s] [be]	85
26	once it has [be]	73
27	once it had [be]	28
28	once it [vb past] [be]	28
29	once it 's [be]	11
30	once it [be] [verb]	146