SN4 ""

No	Pattern	Freq
1	[noun] is [adv] required	283
2	[noun] is [adv] required	181
3	[noun] is [not/n't] required	102
4	[noun] is not required	102
5	[noun] is not required	101
6	[noun] is also required	31
7	[noun] is also required	31
8	[noun] is urgently required	21
9	[noun] is urgently required	21
10	[noun] is still required	19
11	[noun] is still required	19
12	[noun] is usually required	12
13	[noun] is often required	12
14	[noun] is normally required	12
15	[noun] is usually required	12
16	[noun] is normally required	12
17	[noun] is often required	12
18	[noun] is only required	10
19	[noun] is only required	10
20	[noun] is now required	10
21	[noun] is now required	10
22	[noun] is then required	8
23	[noun] is then required	8
24	[noun] is therefore required	8
25	[noun] is therefore required	8
26	[adj] [noun] is required	703
27	[adj] [noun] is required	474
28	[art] [noun] is required	340
29	[art] [noun] is required	340
30	[noun] [noun] is required	258