Kay, you should try answering first, then we can look at your answers- just giving you the answers won't help you much. I could tell you that the first is 'can say', but does that help you understand. You try, then we'll help.
The past future, or future in the past, does exist. It is used to tlak about things that are past now, but were in the future at the time:
He knocked on the door wondering who would open it.
Here, the man was at the door, but 'who would open' refers to a time that was in the future to him then.
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