SN4 ""

No	Pattern	Freq
1	[prep] what is required	43
2	[prep] what is required	43
3	[verb] what is required	40
4	of what is required	26
5	of what is required	26
6	[adv] what is required	25
7	[adv] what is required	22
8	[to-vb] what is required	14
9	know what is required	11
10	exactly what is required	10
11	exactly what is required	10
12	[vb base] what is required	9
13	[vb infin] what is required	8
14	[conj] what is required	8
15	[noun] what is required	7
16	do what is required	7
17	understand what is required	7
18	be what is required	7
19	[be] what is required	7
20	[adj] what is required	6
21	know what is required	5
22	what [noun] is required	10
23	what [noun sg] is required	10
24	what is [adv] required	23
25	what is [adv] required	20
26	what is now required	5
27	what is now required	5
28	what is required [prep]	69
29	what is required [prep]	69
30	what is required [be]	47