SN4 ""

No	Pattern	Freq
1	be [adj] at	1036
2	be present at	100
3	be present at	100
4	be available at	86
5	be available at	86
6	be good at	83
7	be surprised at	69
8	be surprised at	69
9	be good at	52
10	be [adj -er] at	48
11	be better at	29
12	be possible at	24
13	be possible at	24
14	be amazed at	18
15	be amazed at	18
16	be useful at	16
17	be useful at	16
18	be necessary at	15
19	be necessary at	15
20	be successful at	14
21	be successful at	14
22	be [det] at	12
23	be ready at	12
24	be ready at	12
25	be concerned at	11
26	be concerned at	11
27	be pleased at	11
28	be pleased at	11
29	be free at	10
30	be free at	10