SN4 ""

No	Pattern	Freq
1	it is [verb] [prep] the [adj]	369
2	it is [vb pp] [prep] the [adj]	335
3	it is [verb] [prep] the [adj]	300
4	it is [verb] in the [adj]	87
5	it is [verb] by the [adj]	83
6	it is [verb] to the [adj]	46
7	it is [verb] on the [adj]	32
8	it is [v-ing] [prep] the [adj]	24
9	it is [verb] [prep] the [num ord]	23
10	it is [verb] as the [adj]	21
11	it is [verb] with the [adj]	21
12	it is [verb] [prep] the [det]	20
13	it is [verb] [prep] the same	18
14	it is [verb] [prep] the same	18
15	it is base [prep] the [adj]	17
16	it is based [prep] the [adj]	17
17	it is [verb] at the [adj]	16
18	it is [verb] from the [adj]	13
19	it is [verb] [prep] the first	12
20	it is [verb] [prep] the [adj -est]	12
21	it is use [prep] the [adj]	12
22	it is [verb] [prep] the first	12
23	it is used [prep] the [adj]	11
24	it is [to-vb] [prep] the [adj]	10
25	it is [verb] for the [adj]	9
26	it is [verb] [prep] the [adj -er]	7
27	it is built [prep] the [adj]	7
28	it is build [prep] the [adj]	7
29	it is [verb] [prep] the [num]	7
30	it is situate [prep] the [adj]	7