Episode #125 of the Stack Overflow podcast is here. We talk Tilde Club and mechanical keyboards. Listen now
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Q1: She behaved as if she hadn't been here.

She behaved as if she hadn't been here.

This means that, at the time you are talking about, she behaved as if she had not been here on some previous occasion.

She behaved as if she wasn't here.

She behaved as if she wasn't here.

This has the meaning that you are looking for: at the time you are talking about, she behaved as if she were not a part of her surroundings.

Q2: There may be a difference between English and American usage on this one, but I (English) would go for

He looked as if he hadn't had enough sleep.

He looked as if he hadn't had enough sleep.

Q1: She behaved as if she hadn't been here.

This means that, at the time you are talking about, she behaved as if she had not been here on some previous occasion.

She behaved as if she wasn't here.

This has the meaning that you are looking for: at the time you are talking about, she behaved as if she were not a part of her surroundings.

Q2: There may be a difference between English and American usage on this one, but I (English) would go for

He looked as if he hadn't had enough sleep.

Q1:

She behaved as if she hadn't been here.

This means that, at the time you are talking about, she behaved as if she had not been here on some previous occasion.

She behaved as if she wasn't here.

This has the meaning that you are looking for: at the time you are talking about, she behaved as if she were not a part of her surroundings.

Q2: There may be a difference between English and American usage on this one, but I (English) would go for

He looked as if he hadn't had enough sleep.

2 added 166 characters in body
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She behaved as if she hadn't been here.

Q1: She behaved as if she hadn't been here.

This means that, at the time you are talking about, she behaved as if she had tonot been here on some previous occasion.

She behaved as if she wasn't here.

This has the meaning that you are looking for: at the time you are talking about, she behaved as if she were not a part of her surroundings.

Q2: There may be a difference between English and American usage on this one, but I (English) would go for

He looked as if he hadn't had enough sleep.
She behaved as if she hadn't been here.

This means that, at the time you are talking about, she behaved as if she had to been here on some previous occasion.

She behaved as if she wasn't here.

This has the meaning that you are looking for: at the time you are talking about, she behaved as if she were not a part of her surroundings.

Q1: She behaved as if she hadn't been here.

This means that, at the time you are talking about, she behaved as if she had not been here on some previous occasion.

She behaved as if she wasn't here.

This has the meaning that you are looking for: at the time you are talking about, she behaved as if she were not a part of her surroundings.

Q2: There may be a difference between English and American usage on this one, but I (English) would go for

He looked as if he hadn't had enough sleep.
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source | link

She behaved as if she hadn't been here.

This means that, at the time you are talking about, she behaved as if she had to been here on some previous occasion.

She behaved as if she wasn't here.

This has the meaning that you are looking for: at the time you are talking about, she behaved as if she were not a part of her surroundings.