If students had studied until they were 30, Coronavirus pandemic would not have made them lose their jobs and get deported.

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Elena
If I had not studied math, I would not have become an engineer
If she hadn't watched a movie, she would not have learned new slang.
If he had learned guitar, he would have played in a band.
If Kyle had not made tea, he would have made coffee.

If I had not studied math, I would not have become an engineer.
If she had not seen the movie, she would not have learnt new slang.
If he had learnt to play the guitar, he would have played in the band.
If Kyle had made tea, he would not have made coffee.
Kaushik Ragam

I studied math. I became an engineer.
She watched a movie. She learned new slang.
He did not learn guitar. He didn't play in a band.
Kyle did not make tea. He made coffee.