SN4 ""

No	Pattern	Freq
1	[noun sg] [Wh det] is is	5
2	[noun] [Wh det] is is	5
3	[Wh det] [pron] is is	29
4	[Wh det] [pers pn] is is	26
5	[Wh det] it is is	24
6	[Wh det] it is is	24
7	[Wh det] is [adj] is	441
8	[Wh det] is [adj] is	433
9	[Wh det] is [verb] is	330
10	[Wh det] is [vb pp] is	290
11	[Wh det] is needed is	90
12	[Wh det] is need is	90
13	[Wh det] is important is	78
14	[Wh det] is important is	78
15	[Wh det] is clear is	66
16	[Wh det] is clear is	65
17	[Wh det] is certain is	60
18	[Wh det] is certain is	60
19	[Wh det] is required is	45
20	[Wh det] is require is	45
21	[Wh det] is [conj] is	44
22	[Wh det] is [coord] is	44
23	[Wh det] is [pron] is	40
24	[Wh det] is [v-ing] is	38
25	[Wh det] is [Wh det] is	33
26	[Wh det] is or is	26
27	[Wh det] is or is	26
28	[Wh det] is happening is	23
29	[Wh det] is happen is	23
30	[Wh det] is surprising is	19