— I phoned you at six last night, but （）answered. —I （）a walk in the park at that time.

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If I knew it 　 Had I known it If I know it　　　 Did I know it

have already finishing was finishing had just finished was going to finish

and but or so

saw was seeing had seen have seen

have already finished was finishing had just finished was going to finish

had you done; finished were you doing; had just finished did you do; had just finished were you doing; was finishing

have already finished was finishing had just finished was going to finish

am watching was watching watch watched

of; to about; with from; with from; on

phoned visited hit appeared

while until after when

have already finished was finishing had just finished was going to finish

had just finished was finishing was going to finish have already finished

of, to about, with from, with from, on

have already finished was finishing had just finished was going to finish

have you done; finished were you doing; have finished did you do; had just finished were you doing; had just finished

have already finished was finishing had just finished was going to finish