SN4 ""

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