SN4 ""

No	Pattern	Freq
1	[noun] for a [adj] period	227
2	[noun sg] for a [adj] period	169
3	[verb] for a [adj] period	136
4	[vb pp] for a [adj] period	74
5	[adv] for a [adj] period	62
6	[adv] for a [adj] period	49
7	[adj] for a [adj] period	41
8	[noun pl] for a [adj] period	40
9	[adj] for a [adj] period	33
10	[pron] for a [adj] period	27
11	[conj] for a [adj] period	26
12	[pers pn] for a [adj] period	22
13	[vb infin] for a [adj] period	19
14	only for a [adj] period	17
15	only for a [adj] period	17
16	[to-vb] for a [adj] period	15
17	[noun prp] for a [adj] period	13
18	[coord] for a [adj] period	13
19	them for a [adj] period	12
20	they for a [adj] period	12
21	[subord] for a [adj] period	11
22	[adv prt] for a [adj] period	11
23	[v-ing] for a [adj] period	11
24	[be] for a [adj] period	10
25	be for a [adj] period	10
26	and for a [adj] period	9
27	and for a [adj] period	9
28	[vb past] for a [adj] period	8
29	last for a [adj] period	8
30	except for a [adj] period	6