How many of John Steinbeck books became movies?

It's hard to give an exact number for how many of John Steinbeck's books were adapted into movies, because it depends on how you define "adaptation".

Here's a breakdown:

* Direct adaptations: Many of Steinbeck's most famous works have been directly adapted into movies, like "Of Mice and Men", "The Grapes of Wrath", "East of Eden", "Tortilla Flat", "The Red Pony", and "The Pearl".

* Loose adaptations: There are also films that take inspiration from or are based on Steinbeck's themes and characters, but aren't strictly adaptations of a specific book. For example, "The Winter of Our Discontent" is considered a loose adaptation of "East of Eden".

* Multiple adaptations: Some of Steinbeck's books have been adapted multiple times, with varying degrees of fidelity to the source material. For example, "The Grapes of Wrath" has been adapted for film at least twice, and "Of Mice and Men" has been adapted for both film and television.

Therefore, it's more accurate to say that many of Steinbeck's books have been adapted into film, both directly and indirectly, and that some have been adapted multiple times.

If you're interested in a more comprehensive list, you can search online for "John Steinbeck film adaptations" and find detailed lists of films based on his works.