SN4 ""

No	Pattern	Freq
1	[subord] is [vb pp]	560
2	as is [verb]	421
3	than is [verb]	157
4	[subord] is required	58
5	[subord] is require	58
6	[subord] is show	56
7	[subord] is shown	55
8	[subord] is [v-ing]	47
9	[subord] is know	32
10	[subord] is known	32
11	[subord] is suggest	28
12	[subord] is suggested	28
13	[subord] is needed	20
14	[subord] is need	20
15	[subord] is used	17
16	[subord] is use	17
17	[subord] is indicated	16
18	[subord] is indicate	16
19	[subord] is illustrate	15
20	[subord] is illustrated	15
21	[subord] is mention	13
22	[subord] is mentioned	13
23	[subord] is found	12
24	[subord] is find	12
25	[subord] is do	11
26	[subord] is done	11
27	[subord] is see	11
28	[subord] is seen	10
29	[subord] is give	9
30	[subord] is evidence	9