The correct answers are its, it's, its, and it's.
Its (without an apostrophe) is the possessive form, meaning "belonging to it" (e.g., its ability, its own camouflage).
It's (with an apostrophe) is always a contraction for "it is" or "it has" (e.g., it's quite obvious, it's currently glowing).
Its' is never a real word in English!
Possessive
If you've ever stared at its and it's and not been sure which one belonged in your sentence, you've met English's most-confused possessive. The fix is small but immediate: its (no apostrophe) is the possessive of it; it's (with apostrophe) always means it is or it has. Get this right and you instantly look more careful as a writer.
The possessive form shows ownership in English. Most nouns take 's (Sarah's book); plural nouns ending in s take just an apostrophe (students' essays). Pronouns have irregular possessive determiners (my, your, his, her) and pronouns (mine, yours, his, hers).
Apostrophe
If you've ever stared at its and it's and not been sure which one belonged in your sentence, you've met the trickiest pair in English punctuation. Get this single mark right and your writing immediately looks more careful — get it wrong and even otherwise excellent prose looks sloppy.
The apostrophe ( ' ) does two main things in English: it marks missing letters in contractions (don't, they're, we'll) and shows possession with nouns (the eagle's feathers, one month's time). It does not make plurals: write cats, not cat's. The single most-mixed-up case is its (possessive) versus it's (= it is).
Pronoun
If you've ever paused before who vs whom, its vs it's, or me vs I — you've felt how much weight pronouns carry in English. They're tiny words but they're case-sensitive (I vs me), context-dependent, and one of the few places where everyday English still trips careful speakers. Get the common patterns right and you instantly sound more careful.
A pronoun is a closed class of small words that replace nouns or noun phrases. Types: personal (I, you, he…), demonstrative (this, that), relative (who, which), interrogative (who?, what?), reflexive (myself), and indefinite (everyone, nobody).
Determiner
If you speak a language without articles or demonstratives — Mandarin, Russian, Polish, Japanese, Korean — determiners are likely the most stubborn topic in your English. The rules feel small but the wrong choice (I went to home instead of I went home) immediately marks you as non-native. Mastering determiners is the highest-leverage move you can make for sounding natural.
A determiner comes before a noun to clarify which one, how many, or whose. Categories include articles (a/the), demonstratives (this/that), possessives (my/your), and quantifiers (some/many).
Punctuation
If your writing keeps coming back marked up with red — comma here, period there, semicolon nowhere — you're missing the small set of rules that govern English punctuation. There are roughly a dozen marks, and once each one's job is clear (a period for full stops, a comma for short pauses, a semicolon for closely linked independent clauses), the noise drops dramatically.
Punctuation is the set of marks (periods, commas, colons, semicolons, question marks, apostrophes, quotation marks, dashes) that signal sentence structure and rhythm to the reader.
B2 | Upper Intermediate
If a university admissions team or visa office has ever asked you for an English test score, B2 is probably the level they had in mind. It's the threshold where your English stops being a constraint and starts being a tool — and the line between B1 and B2 is often the line between "stuck in beginner classes" and "ready to study or work in English."
B2 is the upper-intermediate level in the CEFR framework, demanding flexible control of mixed conditionals, passive voice across tenses, reported speech with backshifting, and participle clauses.
Difficulty: Medium
If easy questions feel too obvious but hard questions leave you guessing, you're probably ready for Medium — the level where most real learning happens. It pushes just enough to expose the rules you don't quite have yet, without burying you in edge cases. This is where steady fluency is built, one well-aimed challenge at a time.
The Medium difficulty tag marks middle-range challenges — typically A2 to B1. One rule per question, realistic distractors, and contexts that require active thought rather than instant recognition.