SN4 ""

No	Pattern	Freq
1	[verb] what be going on	649
2	know what be [v-ing] on	279
3	[verb] what was [v-ing] on	276
4	[verb] what 's [v-ing] on	246
5	[vb infin] what be [v-ing] on	203
6	[to-vb] what be [v-ing] on	177
7	[verb] what is [v-ing] on	128
8	see what be [v-ing] on	111
9	know what be [v-ing] on	104
10	[vb base] what be [v-ing] on	100
11	[vb past] what be [v-ing] on	74
12	understand what be [v-ing] on	61
13	to know what be [v-ing] on	61
14	know what be [v-ing] on	47
15	to see what be [v-ing] on	44
16	[v-ing] what be [v-ing] on	43
17	see what be [v-ing] on	37
18	[vb pp] what be [v-ing] on	37
19	knew what be [v-ing] on	37
20	understand what be [v-ing] on	25
21	wonder what be [v-ing] on	24
22	to understand what be [v-ing] on	22
23	hear what be [v-ing] on	20
24	[vb -s] what be [v-ing] on	18
25	see what be [v-ing] on	17
26	explain what be [v-ing] on	16
27	wondering what be [v-ing] on	14
28	knows what be [v-ing] on	12
29	known what be [v-ing] on	10
30	realize what be [v-ing] on	9