"kept persuading" is correct and can be used in written English.
You would use it when you want to describe a situation where someone continued to advocate for a certain action or belief despite being met with opposition or disagreement. For example: "Though the other members of the team were skeptical, John kept persuading them that the new project was worth the effort."
E-40 was spawned from a time I like to call the Era of the Microsoft Zune (a.k.a. the late 90s/early 2000s) and has somehow managed to keep persuading people to give him money to make unmemorable music.
Let's go back to what's souring the independent voters: hey, they helped get a guy who wanted to be bold into the White House, he'll never ever have a bigger majority in the Congress to work with (maybe no President ever will!), it sucks that it's not good enough, but you still need to go out and press and press and press and keep persuading people that you've got some fight.
You have to be patient with them and keep persuading them to draw and paint, preferably on paper and sketch books.
However, the turnpike company kept pushing forward, persuading Hand and Hoffman to sell land in 1857 and erecting two tollhouses in the route, one at the Court House (now Cape May Court House) and one near Cold Spring.
Mr. Kay kept working to persuade them to stay, saying in a weekend e-mail message -- a copy of which was made available by parents -- that programs in New York, Montana and Jamaica "would be happy to work with your child".
The evening is framed by scenes with an interviewee who didn't quite get the deal and kept trying to persuade Blythe to pay him for his words with sex: 'You are quite good to my taste.
Recording their conversations was, said Featherstone, also about "trying to keep hold of something; persuading yourself that something is not transient".
Despite these obstacles, President Clinton has worked hard to keep the talks going, persuading Mr. Barak and Mr. Arafat to stay after both had written him letters saying they saw little hope of further progress.
Female community health volunteers in the treatment area effectively and confidently conducted urine pregnancy tests at household level and confirmed pregnancy, offering advice on medical abortion to those not intending to keep their pregnancy, and persuading them for post-abortion family planning.
Mr. Clinton's agenda for the future is to keep trying to persuade Vietnam to open its markets and carry out a new bilateral trade agreement that would clear obstacles that have frustrated foreign investors.
