the past tense of know is (a)   .

past tense of feel is (a)   .

past tense of begin is (a)   .

past tense of befall is (a)   .

past tense of fly is (a)   .

past tense of go is (a)   .

past tense of drink is (a)   .

past tense of shoe is (a)   .

past tense of shrink is (a)   .

past tense of lay is (a)   .

past tense of shake is (a)   .

past tense of show is (a)   .

past tense of smite is (a)   .

past tense of string is (a)   .

past tense of prove is (a)   .