SN4 ""

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