SN4 ""

No	Pattern	Freq
1	[pron] [was/were] about twenty	45
2	[pers pn] [was/were] about twenty	26
3	there [was/were] about twenty	16
4	[ex0] [was/were] about twenty	16
5	there [was/were] about twenty	16
6	it [was/were] about twenty	11
7	it [was/were] about twenty	11
8	[noun] [was/were] about twenty	7
9	i [was/were] about twenty	6
10	i [was/were] about twenty	6
11	[was/were] [verb] about twenty	8
12	[was/were] [adv] about twenty	7
13	[was/were] [adv] about twenty	7
14	[was/were] [vb pp] about twenty	6
15	[was/were] about twenty [noun]	21
16	[was/were] about twenty [adj]	21
17	[was/were] about twenty [num]	20
18	[was/were] about twenty [noun pl]	19
19	[was/were] about twenty five	8
20	[was/were] about twenty five	8
21	[was/were] about twenty yard	5
22	[was/were] about twenty yards	5