1) Scientists have not decided it. Is time travel possible? 2) Many people don't know it. Do some robots think like humans? 3) Many people don't know this. Can we invent a nonpolluting fuel? 4) We can't remember this. Has anyone invented a self-cleaning hause? 5) Many people don't know about this. Are hybrid cars good for the environment? 6) Scientists haven't figured this out. Are there other planets humans can live on? 7) I don't know it. Can I really invent a solar-powered car? 8) I'm not sure. Does he need something from the store? 9) I doubt it. Will our team succeed?  10) I called Bill to find out it. Did he really go to Fiji?  11) We’ll have plenty of photographs to show you but I’m not sure. Will we be able to learn very much from them? 12) The police seemed mainly interested in it. Were there any locks on the windows?

Noun Clauses with whether & if

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