SN4 ""

No	Pattern	Freq
1	[Wh det] it is [to-vb] and	6
2	[pron] it is [to-vb] and	6
3	what it is [to-vb] and	5
4	what it is [to-vb] and	5
5	it is [adj] [to-vb] and	120
6	it is [adj] [to-vb] and	110
7	it is easy [to-vb] and	29
8	it is easy [to-vb] and	24
9	it is [verb] [to-vb] and	15
10	it is possible [to-vb] and	14
11	it is possible [to-vb] and	14
12	it is important [to-vb] and	12
13	it is important [to-vb] and	12
14	it is [vb pp] [to-vb] and	11
15	it is [noun sg] [to-vb] and	10
16	it is [noun] [to-vb] and	10
17	it is time [to-vb] and	10
18	it is time [to-vb] and	10
19	it is necessary [to-vb] and	9
20	it is necessary [to-vb] and	9
21	it is [adj -er] [to-vb] and	6
22	it is difficult [to-vb] and	6
23	it is difficult [to-vb] and	6
24	it is good [to-vb] and	6
25	it is impossible [to-vb] and	5
26	it is impossible [to-vb] and	5
27	it is [to-vb] [noun] and	14
28	it is [to-vb] [noun sg] and	7
29	it is [to-vb] [noun pl] and	7
30	it is [to-vb] and [verb]	14