"Have you ever watched a film i.e Twilight, PS I love You, that has then made you want to read the book?"
Loads of times. That I can think of right now - Gone With the Wind, Minority Report, Blade Runner (Do Androids Dream of Electric Sheep), Dune. I still have 'Never Let Me Go' on my To Read list. And sometimes a TV series - The Dresden Files led me to read the books. Yes, it's predominantly sci-fi.
A lot of posters have said they prefer to read the books first, and broadly I do to - but I can still enjoy reading the books afterwards, and enjoy the further complexity of the story when compared to the stripped-down/sexed-up film interpretation. There's always a lot more to think about from the book, film versions have often concentrated on one aspect of the story (the one easiest to portray visually) and the book is much richer.
"If classics like Shakespeare and Dickens were made into modern films would it make you read the book or play? If so, why? If not, why not?"
"Were made"?" Haven't most of the been done already, many times and in many forms? Not just straight versions but e.g. 10 Things I Hate About You = The Taming of the Shrew, Clueless = Emma by Jane Austen.
Much as I can enjoy filmed versions of Shakespeare, no, it does not lead me to the text. I did it once, for Branagh's Much Ado About Nothing, but TBH it takes too much concentration and sidenotes to get through, so I abandoned it. Dickens - I have read a few, but not lately. By and large the film versions don't make me want to read the books, I think because I'm just not that interested in the stories, I don't think there's many nuances in the books that aren't expressed in the film/TV versions. Jane Austen adaptations did make me read her novels though. I enjoy them, they're a speedy read and I admire her keen eye for the comedy of manners dominant in her time. Her books are not bogged down with unweildy language.
"Oh and your rough age group, if you don't mind please."
49.