Hello....
Is this kind of structure possible?
IF CLAUSE is past tense meaning PRESENT.
1. If he were a doctor, he must have studied hard.
? meaning, If he is a doctor, he must have studied hard.
2. If she were working there, she must have prepared well to get into that company.
? meaning, If she is working ....
3. If they could do it, they would have studied very hard to be in that status.
? meaning, If they can do it...
4. If she knew it, she could have had some tips from her friends.
? meaning, If she knows it, ...............
It is not the past tense. It is the subjunctive mood which carries the meaning that the condition is not true. This is the structure of the second conditional - If I were you, I wouldn't bet all my money on the lottery.
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It is not the past tense. It is the subjunctive mood which carries the meaning that the condition is not true. This is the structure of the second conditional -
If I were you, I wouldn't bet all my money on the lottery. Your chances of winning are one in a billion.
(I am not you!)
Most of your sentences are not proper English. Where did you find them?