SN4 ""

No	Pattern	Freq
1	[verb] to be necessary	117
2	[vb pp] to be necessary	54
3	[adj] to be necessary	20
4	[vb infin] to be necessary	18
5	[vb -s] to be necessary	17
6	[adj] to be necessary	16
7	[vb base] to be necessary	15
8	likely to be necessary	15
9	likely to be necessary	15
10	seem to be necessary	13
11	[noun] to be necessary	12
12	[v-ing] to be necessary	11
13	show to be necessary	10
14	going to be necessary	10
15	go to be necessary	10
16	[pron] to be necessary	10
17	[pers pn] to be necessary	10
18	seem to be necessary	9
19	[noun sg] to be necessary	9
20	prove to be necessary	9
21	appear to be necessary	9
22	shown to be necessary	9
23	thought to be necessary	8
24	think to be necessary	8
25	consider to be necessary	6
26	deem to be necessary	6
27	it to be necessary	6
28	feel to be necessary	6
29	it to be necessary	6
30	find to be necessary	6