Measuring the syntactic maturity in the written English of Arab students at four proficiency levels and establishing an EFL index of development 2026-02-15T20:53:16+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Khared, Muhammad Omar Hasan