SN4 ""

No	Pattern	Freq
1	be [adj] whether	561
2	is [adj] whether	357
3	be doubtful whether	175
4	was [adj] whether	84
5	be unclear whether	70
6	be uncertain whether	62
7	be [adj] whether	55
8	be questionable whether	35
9	be debatable whether	33
10	be unsure whether	31
11	be sure whether	24
12	are [adj] whether	24
13	's [adj] whether	17
14	be true whether	12
15	be immaterial whether	12
16	were [adj] whether	11
17	be certain whether	11
18	be clear whether	7
19	be irrelevant whether	7
20	be unknown whether	6
21	been [adj] whether	6
22	be undecided whether	6
23	be arguable whether	5