The correct answer is "Which car is yours? This one or that one?", which uses the singular pronouns "this one" and "that one" to refer to the cars.
Pronoun
A pronoun is a small, closed class of words that stands in for a noun or noun phrase. The main types: personal (I, you, he, she, it, we, they) plus their object (me, him) and possessive (my, mine) forms; demonstrative (this, that); relative (who, which, that); interrogative (who, what); and reflexive (myself, yourself).
Pronouns are how English avoids endlessly repeating names. The catch: their meaning depends entirely on context, so unclear pronoun reference (Tom told Mike that he was wrong — who's he?) is one of the most common writing problems.
Demonstrative
Demonstratives are pointing words: this, that, these, those. They tell the listener which one you mean — this and these point to things near you; that and those point to things further away (in space, time, or recent attention). They can sit before a noun (Put that coat on) or stand alone as a pronoun (Put that on).
Singular vs plural matches the noun: this book / these books. Mixing them up (these book) is one of the most-corrected slips for learners — small, but immediately noticeable.
Determinative
A determinative is a part of speech that includes articles (a, the), demonstratives (this, that), possessives (my, your), and quantifiers (some, many, each). The Cambridge Grammar treats determinatives as a distinct word class — separate from adjectives, which they were historically grouped with.
The technical distinction: determinative is a lexical category (the type of word), while determiner is a syntactic function (the role it plays before a noun). The same determinative word can function as a determiner (three books) or as a modifier (three more books).
A1 | Elementary | Beginners
A1 is the starting level of the CEFR framework — the entry point into English. At A1 you can introduce yourself, ask and answer simple personal questions, recognise common signs and instructions, and have short slow-paced conversations on very familiar topics.
Grammatically, A1 covers the building blocks: present-tense forms of be, have, and do; basic word order; simple questions; and the most common determiners, pronouns, and prepositions. Knowing your level matters — A1 material teaches the foundations every later level builds on, while a B1 textbook will overwhelm you. Start here and progress is fast.
Difficulty: Easy
The Easy difficulty tag marks questions and challenges aimed at beginners — typically A1 or early A2 level. Expect single-rule focus, short sentences, common everyday vocabulary, and one clear correct answer. Distractors usually rule themselves out quickly.
Filter by Easy when you're rebuilding fundamentals, warming up before harder material, or testing whether you've truly internalised a basic rule before moving on. Easy doesn't mean trivial — it means the rule itself is unambiguous and the context doesn't pile on extra complications.