SN4 ""

No	Pattern	Freq
1	[noun] required [adj]	164
2	[noun sg] required [adj]	97
3	[noun pl] required [adj]	67
4	have required [adj]	56
5	[verb] required [adj]	56
6	[adv] required [adj]	37
7	[adv] required [adj]	37
8	be required [adj]	35
9	[be] required [adj]	35
10	[vb infin] required [adj]	24
11	have required [adj]	24
12	[conj] required [adj]	22
13	[is] required [adj]	20
14	is required [adj]	19
15	[coord] required [adj]	15
16	and required [adj]	14
17	and required [adj]	14
18	[vb past] required [adj]	13
19	had required [adj]	13
20	[vb -s] required [adj]	10
21	has required [adj]	10
22	patient required [adj]	8
23	have required [adj]	7
24	[vb base] required [adj]	7
25	[subord] required [adj]	7
26	patients required [adj]	6
27	be required [adj]	6
28	[be] required [adj]	6
29	[was/were] required [adj]	5
30	also required [adj]	5