SN4 ""

No	Pattern	Freq
1	[verb] what [pron] have been [v-ing]	107
2	[verb] what [pers pn] have been [v-ing]	106
3	[verb] what [pron] 've been [v-ing]	40
4	[verb] what [pron] have been doing	33
5	[vb infin] what [pron] have been [v-ing]	31
6	[verb] what [pron] had been [v-ing]	24
7	know what [pron] have been [v-ing]	24
8	[verb] what he have been [v-ing]	22
9	[vb base] what [pron] have been [v-ing]	22
10	[verb] what he have been [v-ing]	22
11	[verb] what you have been [v-ing]	21
12	[verb] what i have been [v-ing]	21
13	[verb] what you have been [v-ing]	21
14	[verb] what i have been [v-ing]	21
15	[vb past] what [pron] have been [v-ing]	21
16	[verb] what [pron] have been saying	17
17	[verb] what [pron] 'd been [v-ing]	16
18	[to-vb] what [pron] have been [v-ing]	16
19	[verb] what we have been [v-ing]	16
20	[verb] what we have been [v-ing]	16
21	[verb] what [pron] have been [v-ing]	15
22	[verb] what she have been [v-ing]	13
23	[verb] what she have been [v-ing]	13
24	see what [pron] have been [v-ing]	12
25	[verb] what they have been [v-ing]	11
26	[verb] what they have been [v-ing]	11
27	[verb] what [pron] have been missing	10
28	know what [pron] have been [v-ing]	9
29	[verb] what [pron] 's been [v-ing]	8
30	[vb pp] what [pron] have been [v-ing]	7