As soon as he saw her, he fell in love with her.

=> No sooner had he seen her than he fell in love with her.

 If we had known that you were interested in buying the block of flats, we would have sold it to you.

=> Had we known that you were interested in buying the block of flats, we would have sold it to you.

You will never again have such an opportunity.

=> Never again will you have such an opportunity.

We not only wrote to her many times, but telephone her twice, too.

=> Not only did we write to her many times, but we also telephoned her twice.

Immediately he learnt about his mother’s incurable disease, he cried his eyes out.

=> No sooner had he learnt about his mother’s incurable disease than he cried his eyes out.

We have both put aside some money and stocked up with a lot of groceries from the shop next door.

=> Not only have we put aside some money, but we also have stocked up with a lot of groceries from the shop next door.

I did not use suntan lotion, either.

=> Neither did I use suntan lotion.

The wood pigeon flew up.

=> Up flew the wood pigeon.

If you should increase our wages, we will work overtime.

=> Should you increase our wages, we will work overtime.

 She had hardly taken everything out of the picnic basket when it began to rain.

=> Hardly had she taken everything out of the picnic basket when it began to rain.

 If you were to buy a new car, which of these would you choose?

=> Were you to buy a new car, which of these would you choose?

 You should not press both button at once under any circumstances.

=> Under no circumstances should you press both buttons at once.

Jean not once offered her boss a word ò apology.

=> Not once did Jean offer her boss a word of apology.

I didn’t realize who he was until later.

=> Only later did I realize who he was.

He never suspected that the money had been stolen.

=> At no time did he suspect that the money had been stolen.