Choose the right form of the verbs: 1. he would have understood it if . a) have spoken; b) had spoken; c) would speak 2. if i knew that the traffic lights were red a) would have stopped; b) stopped; c) would stop 3. the newspaper would print the story if . a) were; b) had been; c) was 4. if i had known that you were in hospital . a) will visit; b)visited; c) would have visited