SN4 ""

No	Pattern	Freq
1	be [adv] refer to	458
2	be [adv] referred to	448
3	is [adv] refer to	213
4	are [adv] refer to	137
5	be often refer to	91
6	be often refer to	91
7	was [adv] refer to	91
8	be sometimes refer to	64
9	be sometimes refer to	64
10	be [adv] referring to	54
11	be not refer to	49
12	be [not/n't] refer to	49
13	be not refer to	44
14	be usually refer to	34
15	be usually refer to	34
16	be also refer to	25
17	be also refer to	25
18	be generally refer to	24
19	be generally refer to	24
20	were [adv] refer to	22
21	be commonly refer to	17
22	be commonly refer to	17
23	be frequently refer to	16
24	be frequently refer to	16
25	be [adv] refer to	13
26	be now refer to	12
27	be now refer to	12
28	be still refer to	10
29	be then refer to	10
30	been [adv] refer to	10