inversion

You should not ignore our advice under any circumstances.

• Under no circumstances should you ignore our advice.
• Under no circumstances shouldn't you ignore our advice.

If i had been there, the problem wouldn't have occurred.

• Were I there, the problem wouldn't have occured.

• Had I been there, the problem wouldn't occur.

• Were I there, the problem wouldn't occur.

• Had I been there, the problem wouldn't have been occurred.

Little ......................about his aggressive personality when she first met him.

• did she know
• she knows
• hadn´t she known

Kate had never been to London before. (paraphrase)

• Never has Kate been to London before.
• Never before had Kate been to London.
• Never before has Kate been to London. 

I have seldom eaten at such an expensive restaurant.

• Seldom I have eaten at such an expensive restaurant.

• Seldom have I eaten at such an expensive restaurant.

• Seldom eaten I have at such an expensive restaurant.

We realised only then that the jewels had been stolen.

• Only then had we realised that the jewels had been stolen.

• Only then did we realise that the jewels had been stolen.

• Only then realised we that the jewels had been stolen.

The police didn't know that the man was a criminal.

• Little did know the police that the man was a criminal.

• Little knew the police that the man was a criminal.

• Little did the police know that the man was a criminal.

Not only_______ but she is also very intelligent.

• she is beautiful

• beautiful she is

• is she beautiful

• beautiful is she

Only at weekend___________ my kids to Water Park.

• I don't take

• do I take

• I take

• I do take

Only if I had known the difference___________ the more expensive car.

• would I bought

• I would have bought

• would I buy

• would I have bought