SN4 ""

No	Pattern	Freq
1	[noun] required for [noun]	164
2	be required for [noun]	124
3	[be] required for [noun]	124
4	[noun sg] required for [noun]	94
5	[noun pl] required for [noun]	66
6	is required for [noun]	60
7	[is] required for [noun]	60
8	[adv] required for [noun]	33
9	[was/were] required for [noun]	21
10	[adv] required for [noun]	21
11	[be] required for [noun]	21
12	be required for [noun]	21
13	are required for [noun]	17
14	[am/are] required for [noun]	17
15	was required for [noun]	16
16	[adj] required for [noun]	11
17	not required for [noun]	11
18	not required for [noun]	11
19	[det] required for [noun]	11
20	[not/n't] required for [noun]	11
21	[conj] required for [noun]	9
22	[subord] required for [noun]	8
23	that required for [noun]	7
24	time required for [noun]	7
25	time required for [noun]	7
26	that required for [noun]	7
27	skill required for [noun]	6
28	skills required for [noun]	6
29	were required for [noun]	5
30	required [to-vb] for [noun]	15