SN4 ""

No	Pattern	Freq
1	[vb mod] have been [prep] [det]	104
2	[vb mod] have been in [det]	31
3	must have been [prep] [det]	26
4	[vb mod] have been [prep] that	24
5	[vb mod] have been [prep] this	23
6	would have been [prep] [det]	23
7	could have been [prep] [det]	21
8	[vb mod] have been [prep] some	18
9	[vb mod] have been [prep] any	15
10	may have been [prep] [det]	13
11	[vb mod] have been at [det]	13
12	might have been [prep] [det]	10
13	[vb mod] have been of [det]	10
14	[vb mod] have been like [det]	9
15	[vb mod] have been on [det]	7
16	[vb mod] have been to [det]	5
17	should have been [prep] [det]	5
18	[vb mod] have been for [det]	5