SN4 ""

No	Pattern	Freq
1	it has been [vb pp] [prep]	934
2	it had been [vb pp] [prep]	665
3	it have been [vb pp] by	483
4	it have been [vb pp] in	293
5	it have been [vb pp] to	225
6	it 's been [vb pp] [prep]	215
7	it have been [vb pp] for	172
8	it have been [vb pp] as	108
9	it have been [vb pp] with	92
10	it have been [vb pp] on	80
11	it have been [vb pp] from	79
12	it have been [vb pp] at	69
13	it have been [vb pp] into	67
14	it have been used [prep]	57
15	it have been known [prep]	49
16	it have been suggested [prep]	47
17	it have been shown [prep]	34
18	it have been made [prep]	32
19	it have been [vb pp] of	30
20	it have been done [prep]	26
21	it have been left [prep]	23
22	it have been recorded [prep]	23
23	it have been built [prep]	22
24	it have been written [prep]	21
25	it have been taken [prep]	19
26	it have been held [prep]	19
27	it have been found [prep]	19
28	it have been argued [prep]	19
29	it have been described [prep]	19
30	it have been put [prep]	18