SN4 ""

No	Pattern	Freq
1	been [v-ing] since [adj]	54
2	been [v-ing] since [num]	47
3	been [v-ing] since [art]	42
4	been [v-ing] since the	42
5	been [v-ing] since the	42
6	been [v-ing] since [art]	42
7	been [v-ing] since [noun]	34
8	been [v-ing] since [noun prp]	28
9	been [v-ing] since [pron]	10
10	been [v-ing] since [pos pn]	10
11	been [v-ing] since [adv]	9
12	been [v-ing] since [adv]	8
13	been [v-ing] since his	7
14	been [v-ing] since his	7
15	been [v-ing] since [noun sg]	6
16	been [v-ing] since then	5
17	been [v-ing] since 1987	5
18	been [v-ing] since january	5
19	been [v-ing] since january	5
20	been [v-ing] since nineteen	5
21	been [v-ing] since then	5
22	been [v-ing] since 1987	5
23	been [v-ing] since nineteen	5
24	[verb] been [v-ing] since	145
25	have been [v-ing] since	145
26	[vb -s] been [v-ing] since	57
27	[vb past] been [v-ing] since	54
28	has been [v-ing] since	51
29	had been [v-ing] since	49
30	[vb base] been [v-ing] since	32