ways of saying ‘I don’t know’ :
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1) Dunno:
used informally, in spoken language.
Example:
-A: ‘Are you cAoming out later?’Example:
-A: ‘Who left this rubbish all over the table?’-A:‘Why didn’t he call me himself?’
-B: ‘Don’t ask me. I’m only the messenger.’-A: ‘Why didn’t he say he wasn’t coming?’
-B: ‘Search me. He never tells me anything.’used for saying that you don’t know something because it is impossible for anyone to know it.
Example:
-A: ‘When will this situation ever be resolved?’-A: ‘How the situation will develop from here
-B: is anyone’s guess.’Example:
-A: ‘Has James left the company? I haven’t seen him for ages.’
-B: ‘Not as far as I know, but I haven’t seen him recently either.’
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5) It beats me:
used for saying that you do not know or understand something.
Example:
-A: ‘Why did he do such a stupid thing?’
-B: ‘It beats me.’
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