SN4 ""

No	Pattern	Freq
1	it have been [vb pp] [prep] a	260
2	it has been [vb pp] [prep] a	141
3	it had been [vb pp] [prep] a	88
4	it have been [vb pp] as a	67
5	it have been [vb pp] as a	67
6	it have been [vb pp] by a	60
7	it have been [vb pp] by a	60
8	it 's been [vb pp] [prep] a	30
9	it have been [vb pp] to a	23
10	it have been [vb pp] to a	23
11	it have been [vb pp] in a	22
12	it have been [vb pp] in a	22
13	it have been [vb pp] into a	20
14	it have been [vb pp] into a	20
15	it have been [vb pp] for a	18
16	it have been [vb pp] for a	18
17	it have been [vb pp] with a	17
18	it have been [vb pp] with a	17
19	it have been [vb pp] on a	15
20	it have been [vb pp] on a	15
21	it have been used [prep] a	15
22	it have been [vb pp] at a	7
23	it have been built [prep] a	7
24	it have been [vb pp] at a	7
25	it have been known [prep] a	7
26	it have been described [prep] a	7
27	it have been made [prep] a	6
28	it have been converted [prep] a	5
29	it have been hit [prep] a	5
30	it have been written [prep] a	5