SN4 ""

No	Pattern	Freq
1	has [adv] become	388
2	had [adv] become	336
3	have now become	230
4	have [adv] become	177
5	have also become	108
6	have suddenly become	67
7	have already become	67
8	have recently become	46
9	have since become	42
10	have just become	33
11	have thus become	20
12	've [adv] become	19
13	have increasingly become	19
14	have never become	19
15	have quickly become	14
16	have therefore become	14
17	have only become	13
18	have again become	10
19	have almost become	10
20	have gradually become	9
21	have all become	9
22	have indeed become	9
23	have effectively become	9
24	have finally become	9
25	have subsequently become	8
26	have then become	8
27	have somehow become	7
28	have rapidly become	7
29	have lately become	6
30	have actually become	6