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• When the verb before as if/though is in a present or present perfect tense, we only use a past tense for comparisons that we know aren't true.
✓ She behaves as if she were really wealthy. ( = She's not really wealthy.)
• When the verb before as if/though is in a present or present perfect tense, for comparisons that are possible, we use a present or present perfect tense after as if/though.
✓ She looks as if she's really wealthy. ( = It's very possible that she is wealthy.)
• When the verb before as if/though is in a past tense, we use a past tense after as if/though for comparisons that are either true or hypothetical.
✓ She looked as if she was really wealthy but I knew she wasn't/so maybe she was.
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