Unreal Past - Supposing, It's time, As if (As though)

ANSWERS 1: ABOUT TIME YOU HAD
EXPLANATION
IT'S (HIGH/ABOUT) TIME + PAST SIMPLE is used to say that something is not happening, but it should be happening.
More Examples:
It is time he were back from work. X We cannot use WERE after IT'S TIME + I/he/she/it!
It is time he was back from work. V

ANSWERS 2: AS THOUGH SHE KNEW
EXPLANATION
AS THOUGH/AS IF + PAST SIMPLE shows improbable, unreal or doubtful situations in the present.
More Examples:
She behaves as if/as though she had a million dollars. V She doesn't have a million dollar! (UNREAL SITUATION)
She behaves as if/as though she has a million dollars. V She has a million dollar! (REAL SITUATION)
He looks as if/as though he was/were ill. V WERE instead of WAS can be used in all persons!

ANSWERS 3: SUPPOSING YOU WERE ROBBED
EXPLANATION
SUPPOSING/SUPPOSE/WHAT IF/IMAGINE + PAST SIMPLE (PAST PERFECT) is used with past simple or past perfect to ask questions about imaginary situations.
More Examples:
Supposing you failed your exam, what would you do? V PAST SIMPLE for imaginary situations in the present!
Suppose he hadn't been at school. V PAST PEFECT for imaginary situations in the past!

ANSWERS 4: IF THE CAT HAD BEEN
EXPLANATION
AS THOUGH/AS IF + PAST PERFECT is used to refer to an imaginary or real situations in the past.
More Examples:
She talks about Bono as if/as though she had met him herself. V She probably didn't meet Bono! (UNREAL SITUATION)
She talked about Bono as if/as though she had met him herself. V We can change the tense preceding AS IF/ AS THOUGH to the past.

ANSWERS 5: HIGH TIME SHE GAVE
EXPLANATION
IT'S (HIGH/ABOUT) TIME + PAST SIMPLE is used to say that something is not happening, but it should be happening.
More Examples:
It is time he were back from work. X We cannot use WERE after IT'S TIME + I/he/she/it!
It is time he was back from work. V
It is time for her to go to bed. V IT'S (ABOUT/HIGH) TIME + FOR + SB + TO + INFINITIVE is also possible!

ANSWERS 6: WOULD HAVE BEEN BETTER
EXPLANATION
IT WOULD HAVE BEEN BETTER + IF + PAST PERFECT => past reference.
More Examples:
It would have been better if you had taken that medicine. V IT WOULD HAVE BEEN BETTER + IF + PAST PERFECT = THIRD CONDITIONAL (PAST)
It would be better if you took that medicine. V IT WOULD BE BETTER + IF + PAST SIMPLE = SECOND CONDITIONAL (PRESENT/FUTURE)