SN4 ""

No	Pattern	Freq
1	it be [adj] for [noun pl]	384
2	it is [adj] for [noun pl]	243
3	it was [adj] for [noun pl]	93
4	it 's [adj] for [noun pl]	53
5	it be possible for [noun pl]	48
6	it be possible for [noun pl]	48
7	it be important for [noun pl]	40
8	it be important for [noun pl]	40
9	it be [adj] for children	33
10	it be common for [noun pl]	31
11	it be common for [noun pl]	31
12	it be difficult for [noun pl]	28
13	it be difficult for [noun pl]	28
14	it be easy for [noun pl]	19
15	it be good for [noun pl]	18
16	it be good for [noun pl]	14
17	it be [adj] for women	14
18	it be [adj -er] for [noun pl]	12
19	it be easy for [noun pl]	12
20	it be [adj] for men	12
21	it be [adj] for parents	10
22	it be usual for [noun pl]	10
23	it be normal for [noun pl]	10
24	it be [adj] for teachers	10
25	it be normal for [noun pl]	10
26	it be usual for [noun pl]	10
27	it be customary for [noun pl]	9
28	it be necessary for [noun pl]	9
29	it be necessary for [noun pl]	9
30	it be customary for [noun pl]	9