SN4 ""

No	Pattern	Freq
1	[prep] about thirty	89
2	[prep] about thirty	89
3	[be] about thirty	78
4	be about thirty	78
5	[verb] about thirty	56
6	[adv] about thirty	40
7	of about thirty	37
8	of about thirty	37
9	[is] about thirty	28
10	[was/were] about thirty	28
11	for about thirty	24
12	for about thirty	24
13	[adv] about thirty	24
14	[adv prt] about thirty	16
15	[vb pp] about thirty	16
16	's about thirty	16
17	was about thirty	15
18	[noun] about thirty	15
19	[conj] about thirty	14
20	be about thirty	13
21	were about thirty	13
22	[be] about thirty	13
23	[vb past] about thirty	12
24	is about thirty	12
25	to about thirty	11
26	only about thirty	11
27	only about thirty	11
28	to about thirty	11
29	[pron] about thirty	10
30	[noun sg] about thirty	9