1/ 你是说every one吧
被动 His idea can be understood by every one.(咦,every one是一个字还是两个字?)
否定 Not every one can understand his idea.
疑问 Can every one understand his idea?
2/
Computersquite can be bought by you cheaply now(没错,虽然我不知啥是computersquite)
You can't buy computersquite cheaply now.
Can you buy computersquite cheaply now?
剩下的你还要吗?举一反三吧不难