SN4 ""

No	Pattern	Freq
1	[be] the key to [noun]	89
2	be the key to [noun]	89
3	[verb] the key to [noun]	54
4	[is] the key to [noun]	47
5	is the key to [noun]	45
6	hold the key to [noun]	20
7	[was/were] the key to [noun]	20
8	[prep] the key to [noun]	16
9	[prep] the key to [noun]	16
10	was the key to [noun]	16
11	[conj] the key to [noun]	13
12	[vb -s] the key to [noun]	13
13	[vb infin] the key to [noun]	12
14	[vb past] the key to [noun]	11
15	that the key to [noun]	10
16	[that] the key to [noun]	10
17	that the key to [noun]	10
18	[be] the key to [noun]	9
19	[vb base] the key to [noun]	9
20	as the key to [noun]	9
21	be the key to [noun]	9
22	[adv] the key to [noun]	9
23	as the key to [noun]	9
24	are the key to [noun]	8
25	[am/are] the key to [noun]	8
26	[adv] the key to [noun]	7
27	hold the key to [noun]	7
28	of the key to [noun]	6
29	of the key to [noun]	6
30	[pron] the key to [noun]	5