IF (meaning ‘whether’)

How can we formally find ‘if’ meaning ‘whether’?  Generally the following infitives will precede ‘if’:

((?:kn[eo]w|matter|seen?|saw|care|wonder|tell|told|remember|determine|mind)\w*) + if

1 I (PPIS1 ) DO (VD0) N’T (XX) KNOW (VVI) IF (CSW@_CS) 79855
2 I (PPIS1 ) DO (VD0) NT (XX) KNOW (VVI) IF (CSW@_CS) 35004
3 IT (PPH1 ) DOES (VDZ) N’T (XX) MATTER (VVI) IF (CSW@_CS) 15853
4 . (. ) LET (VV0) ME (PPIO1) KNOW (VVI) IF (CSW@_CS) 12707
5 IT (PPH1 ) DOES (VDZ) NT (XX) MATTER (VVI) IF (CSW@_CS) 8901
6 BE (VBI ) INTERESTING (JJ) TO (TO) SEE (VVI) IF (CSW@_CS) 7656
7 WOULD (VM ) LIKE (VVI) TO (TO) KNOW (VVI) IF (CSW@_CS) 7527
8 I (PPIS1 ) DO (VD0) N’T (XX) CARE (VVI) IF (CSW@_CS) 7460
9 . (. ) I (PPIS1) WAS (VBDZ) WONDERING (VVG) IF (CSW@_CS) 6818
10 HOW (RRQ ) DO (VD0) YOU (PPY) KNOW (VVI) IF (CSW@_CS) 6733
11 . (. ) (NULL) I (PPIS1) WONDER (VV0) IF (CSW@_CS) 6259
12 I (PPIS1 ) DO (VD0) NOT (XX) KNOW (VVI) IF (CSW@_CS) 5889
13 (NULL ) I (PPIS1) WAS (VBDZ) WONDERING (VVG) IF (CSW@_CS) 5071
14 HOW (RRQ ) DO (VD0) I (PPIS1) KNOW (VVI) IF (CSW@_CS) 4642
15 WE (PPIS2 ) DO (VD0) N’T (XX) KNOW (VVI) IF (CSW@_CS) 4479
16 . (. ) LET (VV0) US (PPIO2) KNOW (VVI) IF (CSW@_CS) 4134
17 . (. ) DOES (VDZ) ANYONE (PN1) KNOW (VVI) IF (CSW@_CS) 3928
18 I (PPIS1 ) WAS (VBDZ) JUST (RR) WONDERING (VVG) IF (CSW@_CS) 3888
19 I (PPIS1 ) DO (VD0) NT (XX) CARE (VVI) IF (CSW@_CS) 3785
20 . (. ) DO (VD0) N’T (XX) KNOW (VVI) IF (CSW@_CS) 3768
21 (NULL ) LET (VV0) ME (PPIO1) KNOW (VVI) IF (CSW@_CS) 3764
22 . (. ) DO (VD0) YOU (PPY) KNOW (VVI) IF (CSW@_CS) 3737
23 IT (PPH1 ) DOES (VDZ) NOT (XX) MATTER (VVI) IF (CSW@_CS) 3669
24 . (. ) DO (VD0) N’T (XX) WORRY (VVI) IF (CSW@_CS) 3643
25 PLEASE (RR ) LET (VV0) ME (PPIO1) KNOW (VVI) IF (CSW@_CS) 3597
26 (NULL ) DOES (VDZ) ANYONE (PN1) KNOW (VVI) IF (CSW@_CS) 3572
27 I (PPIS1 ) WANT (VV0) TO (TO) KNOW (VVI) IF (CSW@_CS) 3435
28 , (, ) CHECK (VV0) TO (TO) SEE (VVI) IF (CSW@_CS) 3347
29 . (. ) I (PPIS1) ‘M (VBM) WONDERING (VVG) IF (CSW@_CS) 3302
30 , (, ) I (PPIS1) WAS (VBDZ) WONDERING (VVG) IF (CSW@_CS) 2912
31 AND (CC ) I (PPIS1) WAS (VBDZ) WONDERING (VVG) IF (CSW@_CS) 2839
32 DO (VD0 ) N’T (XX) EVEN (RR) KNOW (VVI) IF (CSW@_CS) 2813
33 TO (TO ) CHECK (VVI) TO (TO) SEE (VVI) IF (CSW@_CS) 2791
34 . (. ) I (PPIS1) AM (VBM) WONDERING (VVG) IF (CSW@_CS) 2584
35 . (. ) CHECK (VV0) TO (TO) SEE (VVI) IF (CSW@_CS) 2499
36 YOU (PPY ) DO (VD0) N’T (XX) KNOW (VVI) IF (CSW@_CS) 2477
37 I (PPIS1 ) WANTED (VVD) TO (TO) KNOW (VVI) IF (CSW@_CS) 2393
38 I (PPIS1 ) WANTED (VVD) TO (TO) SEE (VVI) IF (CSW@_CS) 2325
39 I (PPIS1 ) DID (VDD) N’T (XX) KNOW (VVI) IF (CSW@_CS) 2233
40 , (, ) BUT (CCB) I (PPIS1) WONDER (VV0) IF (CSW@_CS) 2220
41 (NULL ) LET (VV0) US (PPIO2) KNOW (VVI) IF (CSW@_CS) 2204
42 HOW (RRQ ) CAN (VM) YOU (PPY) TELL (VVI) IF (CSW@_CS) 2166
43 BUT (CCB ) I (PPIS1) WAS (VBDZ) WONDERING (VVG) IF (CSW@_CS) 2134
44 HOW (RRQ ) WOULD (VM) YOU (PPY) FEEL (VVI) IF (CSW@_CS) 2118
45 WILL (VM ) LET (VVI) YOU (PPY) KNOW (VVI) IF (CSW@_CS) 2089
46 (NULL ) DO (VD0) N’T (XX) KNOW (VVI) IF (CSW@_CS) 2051
47 (NULL ) I (PPIS1) ‘M (VBM) WONDERING (VVG) IF (CSW@_CS) 1998
48 BE (VBI ) ABLE (JK) TO (TO) TELL (VVI) IF (CSW@_CS) 1993
49 . (. ) DO (VD0) NT (XX) WORRY (VVI) IF (CSW@_CS) 1987
50 (NULL ) CHECK (VV0) TO (TO) SEE (VVI) IF (CSW@_CS) 1971
51 (NULL ) DO (VD0) YOU (PPY) KNOW (VVI) IF (CSW@_CS) 1928
52 I (PPIS1 ) CA (VM) N’T (XX) TELL (VVI) IF (CSW@_CS) 1890
53 WE (PPIS2 ) DO (VD0) NT (XX) KNOW (VVI) IF (CSW@_CS) 1846
54 ONLY (JJ ) TIME (NNT1) WILL (VM) TELL (VVI) IF (CSW@_CS) 1818
55 JUST (RR ) WANT (VV0) TO (TO) KNOW (VVI) IF (CSW@_CS) 1801
56 HOW (RRQ ) CAN (VM) I (PPIS1) TELL (VVI) IF (CSW@_CS) 1715
57 . (. ) DO (VD0) NOT (XX) USE (VVI) IF (CSW@_CS) 1705
58 ! (! ) LET (VV0) ME (PPIO1) KNOW (VVI) IF (CSW@_CS) 1695
59 I (PPIS1 ) ‘M (VBM) JUST (RR) WONDERING (VVG) IF (CSW@_CS) 1694
60 IN (BCL21 ) ORDER (BCL22) TO (TO) DETERMINE (VVI) IF (CSW@_CS) 1680
61 YOU (PPY ) WANT (VV0) TO (TO) KNOW (VVI) IF (CSW@_CS) 1657
62 I (PPIS1 ) DU (VD0) N (XX) NO (VVI) IF (CSW@_CS) 1649
63 I (PPIS1 ) CA (VM) N’T (XX) REMEMBER (VVI) IF (CSW@_CS) 1624
64 ‘D (VM ) LIKE (VVI) TO (TO) KNOW (VVI) IF (CSW@_CS) 1617
65 (NULL ) DO (VD0) N’T (XX) WORRY (VVI) IF (CSW@_CS) 1579
66 YOU (PPY ) NEED (VV0) TO (TO) KNOW (VVI) IF (CSW@_CS) 1559
67 I (MC1_ZZ1 ) DO (VD0) NT (XX) KNOW (VVI) IF (CSW@_CS) 1525
68 . (. ) LET (VM21) ‘S (VM22) SEE (VVI) IF (CSW@_CS) 1519
69 , (, ) DO (VD0) YOU (PPY) KNOW (VVI) IF (CSW@_CS) 1496
70 THE (AT ) WAY (NN1) TO (TO) GO (VVI) IF (CSW@_CS) 1485
71 PLEASE (RR ) LET (VV0) US (PPIO2) KNOW (VVI) IF (CSW@_CS) 1455
72 (NULL ) I (PPIS1) AM (VBM) WONDERING (VVG) IF (CSW@_CS) 1431
73 TO (TO ) WAIT (VVI) AND (CC) SEE (VVI) IF (CSW@_CS) 1424
74 . (. ) WE (PPIS2) ‘LL (VM) SEE (VVI) IF (CSW@_CS) 1403
75 I (PPIS1 ) HAVE (VH0) TO (TO) WONDER (VVI) IF (CSW@_CS) 1403
76 AND (CC ) CHECK (VV0_NN1) TO (TO) SEE (VVI) IF (CSW@_CS) 1389
77 , (, ) I (PPIS1) ‘M (VBM) WONDERING (VVG) IF (CSW@_CS) 1387
78 . (. ) DO (VD0) NT (XX) KNOW (VVI) IF (CSW@_CS) 1381
79 NO (AT ) WAY (NN1) OF (IO) KNOWING (VVG) IF (CSW@_CS) 1365
80 (NULL ) WHAT (DDQ) WOULD (VM) HAPPEN (VVI) IF (CSW@_CS) 1359
81 BUT (CCB ) I (PPIS1) ‘M (VBM) WONDERING (VVG) IF (CSW@_CS) 1349
82 DO (VD0 ) NT (XX) EVEN (RR) KNOW (VVI) IF (CSW@_CS) 1347
83 , (, ) DO (VD0) N’T (XX) KNOW (VVI) IF (CSW@_CS) 1335
84 WE (PPIS2 ) DO (VD0) NOT (XX) KNOW (VVI) IF (CSW@_CS) 1322
85 AND (CC ) I (PPIS1) ‘M (VBM) WONDERING (VVG) IF (CSW@_CS) 1316
86 SO (CS@_RR ) YOU (PPY) CAN (VM) SEE (VVI) IF (CSW@_CS) 1316
87 AND (CC ) LET (VV0) ME (PPIO1) KNOW (VVI) IF (CSW@_CS) 1308
88 I (ZZ1_MC1 ) DO (VD0) NT (XX) KNOW (VVI) IF (CSW@_CS) 1272
89 CAN (VM ) CHECK (VVI) TO (TO) SEE (VVI) IF (CSW@_CS) 1270
90 YOU (PPY ) DO (VD0) NT (XX) KNOW (VVI) IF (CSW@_CS) 1269
91 I (PPIS1 ) NEED (VV0) TO (TO) KNOW (VVI) IF (CSW@_CS) 1257
92 N’T (XX ) HELP (VVI) BUT (CCB) WONDER (VV0) IF (CSW@_CS) 1254
93 I (PPIS1 ) DO (VD0) N’T (XX) MIND (VVI) IF (CSW@_CS) 1201
94 BE (VBI ) ABLE (JK) TO (TO) SEE (VVI) IF (CSW@_CS) 1199
95 HOW (RRQ ) WILL (VM) I (PPIS1) KNOW (VVI) IF (CSW@_CS) 1194
96 , (, ) JUST (RR) TO (TO) SEE (VVI) IF (CSW@_CS) 1180
97 I (MC1_ZZ1 ) DO (VD0) N’T (XX) KNOW (VVI) IF (CSW@_CS) 1166
98 I (PPIS1 ) DO (VD0) N’T (XX) REMEMBER (VVI) IF (CSW@_CS) 1137
99 . (. ) TIME (NNT1) WILL (VM) TELL (VVI) IF (CSW@_CS) 1134
100 YOU (PPY ) HAVE (VH0) TO (TO) WONDER (VVI) IF (CSW@_CS)