Do not use a noun phrase immediately after as if and as thought: ‘She looked at me as if/though she’d never seen me before’; ‘He walked with difficulty as if/though (he were) in pain.’
As conjunction: (1) In the same way that it would be if: ‘It looked as if she were made of ice, (2) That: It seemed as if the meeting would never end, (3) indicates something is unlikely and should not be considered: ‘As if it is going to be of any use to me!’
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