May has refused to directly debate Corbyn, and so the BBC's "Question Time" featured the two leaders consecutively, with the prime minister going first.
"We are fighting this election to win and we are mounting a fantastic campaign in order to get that message across of how different our society and our politics could be", he said.
It was the toughest audience May has faced in a campaign where her appearances have been tightly controlled, and it got a rise out of the prime minister.
"All deaths are wrong", Corbyn replied.
Betting that she would win a strong majority, May called the snap election to strengthen her position at home as she embarked on complicated Brexit negotiations with 27 other members of the European Union.
Mrs May offered her little reassurance, saying: "We have had to take some hard choices across the public sector, and I'm being honest with you that we will put more money into the NHS but there isn't a magic money tree we can just shake".
University of Queensland political science lecturer Joff Lelliott told The New Daily the Conservatives will "still nearly certainly win the election", but it was unlikely they would now win with the huge majority of 100-150 seats that many initially predicted.
"Let's hope that no prime minister of any political persuasion in the future is ever put in the situation that they will effectively be wiping out humanity, because that is a failure of diplomacy, it's a failure of foreign policy and it's a failure of defence policy".
May became prime minister without winning an election in July previous year following the resignation of David Cameron after Britons went against his advice and voted to leave the EU.
Against the Bank of England's trade-weighted basket, which measures sterling's broader strength, the pound is now back where it was on 9 April, before May called the election.
In her most powerful attack yet on Mr Corbyn, the Prime Minister writes: 'With a weak Labour Prime Minister at the head of a weak government, our economy would collapse and Britain would be the laughing stock of the world'. Our manifesto is a serious, well thought-out document, that I believe is getting a lot of support and people are getting very excited at the idea of how we can do things differently'. "But this is an important moment for our country, we've got to get it right", she said.
"If parliamentary arithmetic allowed it, I would want the SNP to be part of a progressive alternative to a Conservative government, not as a coalition, but on an issue by issue basis", Sturgeon said.
The Prime Minister promised further investment and a new Mental Health Act to end workplace discrimination. Mrs May said the United Kingdom was an independent nation and she had spoken to Mr Trump the night before, telling him the United Kingdom believed in the Paris agreement and didn't want him to leave.