SN4 ""

No	Pattern	Freq
1	it was [adj] for [pron]	302
2	it was [adj] for [pron]	261
3	it was [adv] for [pron]	91
4	it was [not/n't] for [pron]	69
5	it was not for [pron]	69
6	it was [noun] for [pron]	61
7	it was [noun sg] for [pron]	60
8	it was time for [pron]	52
9	it was time for [pron]	52
10	it was [verb] for [pron]	46
11	it was n't for [pron]	44
12	it was [adj -er] for [pron]	32
13	it was [vb pp] for [pron]	31
14	it was good for [pron]	29
15	it was impossible for [pron]	26
16	it was impossible for [pron]	26
17	it was easy for [pron]	25
18	it was not for [pron]	25
19	it was difficult for [pron]	22
20	it was difficult for [pron]	22
21	it was [adv] for [pron]	21
22	it was possible for [pron]	21
23	it was possible for [pron]	21
24	it was necessary for [pron]	17
25	it was hard for [pron]	17
26	it was necessary for [pron]	17
27	it was hard for [pron]	16
28	it was [v-ing] for [pron]	14
29	it was important for [pron]	14
30	it was important for [pron]	14