SN4 ""

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