SN4 ""

No	Pattern	Freq
1	[modal v] have left	305
2	[vb mod] have left	305
3	would have left	107
4	would have left	98
5	[adv] have left	89
6	must have left	52
7	must have left	52
8	[adv] have left	45
9	[not/n't] have left	44
10	not have left	44
11	might have left	38
12	might have left	38
13	n't have left	35
14	should have left	33
15	should have left	33
16	[pron] have left	32
17	[pers pn] have left	32
18	could have left	28
19	could have left	28
20	may have left	22
21	may have left	22
22	will have left	22
23	will have left	21
24	never have left	19
25	never have left	19
26	you have left	14
27	you have left	14
28	not have left	9
29	'd have left	9
30	we have left	6