SN4 ""

No	Pattern	Freq
1	be what [pers pn] have been [v-ing]	77
2	[is] what [pers pn] have been [v-ing]	60
3	's what [pers pn] have been [v-ing]	44
4	[be] what [pers pn] 've been [v-ing]	44
5	[be] what i have been [v-ing]	31
6	[be] what [pers pn] have been doing	23
7	was what [pers pn] have been [v-ing]	17
8	[was/were] what [pers pn] have been [v-ing]	17
9	is what [pers pn] have been [v-ing]	16
10	[be] what we have been [v-ing]	13
11	[be] what [pers pn] had been [v-ing]	12
12	[be] what you have been [v-ing]	12
13	[be] what she have been [v-ing]	12
14	[be] what [pers pn] 'd been [v-ing]	12
15	[be] what [pers pn] have been trying	7
16	[be] what [pers pn] have been [v-ing]	7
17	[be] what [pers pn] have been waiting	7
18	[be] what he have been [v-ing]	6