If you speak Turkish, some English grammar rules will feel natural and others will feel confusing. These are the biggest differences to focus on first.
Turkish is strictly SOV — the verb never moves from the end. English is strictly SVO — the verb always comes in the middle. For Turkish speakers, every English sentence requires a complete structural reordering.
Turkish has no articles. Definiteness is expressed differently through word order and context. English articles 'a', 'an', and 'the' must be learned entirely from scratch.
Turkish adds suffixes to verb roots to express tense, negation, person, and mood — sometimes stacking four or five suffixes onto one root word. English uses separate words for each of these functions.