Then vs Than

1. Then: The Time and Sequence Word

Then primarily relates to time and sequence. It can mean "at that time" (past or future): "I was young then." It can mean "next in order" or "after that": "Finish your homework, then you can play." It can also mean "in that case" or "therefore": "If you're tired, then rest." Notice how all these uses involve timing or logical sequence.

Think of "then" as connected to "when" — they rhyme, and both deal with time. If your sentence involves temporal ordering (first this, then that) or refers to a specific time period (back then, until then), you need "then." It helps establish the sequence of events or the timing of actions.

2. Than: The Comparison Conjunction

Than is used exclusively for comparisons. It introduces the second part of a comparison: "faster than," "more expensive than," "different than," "less than." Whenever you're comparing two things, quantities, qualities, or actions, you need "than." It's the word that bridges the two elements being compared.

Look for comparative adjectives and adverbs — they almost always take "than": bigger than, smaller than, more quickly than, less frequently than. If you can identify what's being compared (A compared to B), "than" is the bridge. "This book is better than that one" — the book and that one are being compared, so "than" connects them.

3. Pronunciation Differences Matter

Then is pronounced like "when" with a TH sound: THENN (rhymes with "hen," "pen," "when"). The vowel sound is a short "e" as in "bed." Some dialects may pronounce it similarly to "than," but standard pronunciation maintains the distinction.

Than is pronounced with a short "a" sound: THAN (rhymes with "can," "pan," "man"). The vowel is the same as in "cat" or "bat." In casual speech, "than" is often reduced to a weak form that sounds like "thun" or "thən," especially in phrases like "better than" (which might sound like "better'n"). However, when stressed or in formal speech, the "a" sound is clear.

This pronunciation difference is your first clue when proofreading. If you say the sentence aloud with proper pronunciation, you can often catch errors. "I'd rather go now then later" sounds wrong when you pronounce "then" fully — it should be "than" to make the comparison.

4. Common Contexts and Collocations

Then appears in these contexts: temporal sequences ("and then," "then suddenly," "then again"), conditional statements ("if...then," "then you should"), past time references ("back then," "since then," "until then," "by then"), and phrases like "now and then," "every now and then," "there and then."

Than appears exclusively with comparatives: "more/less than," "better/worse than," "rather than," "other than," "no sooner...than," "hardly...than." It's also used with "different than" (American) or "different from" (British), and in expressions like "none other than," "no less than," "more than ever."

5. Grammatical Functions

Then has multiple grammatical roles. As an adverb, it modifies verbs by indicating when: "We lived there then." As an adjective, it means "existing at that time": "the then-president." As a noun, it refers to a particular time: "Since then, everything changed." It can also function as a conjunctive adverb showing consequence: "I think, therefore I am" is similar to "I think; then I am."

Than functions primarily as a conjunction joining two parts of a comparison: "She's smarter than he is." In some cases, particularly in informal English, it acts as a preposition: "She's smarter than him." This preposition vs. conjunction debate has existed for centuries, but both forms are widely accepted in modern English.

6. The If/Then Construction vs. Comparisons

One specific source of confusion is the if/then conditional structure. This construction shows cause and effect or logical consequence: "If you study hard, then you'll pass the exam." The "then" here indicates the consequence or result that follows from the condition. It's about sequence and causation, not comparison.

Don't confuse this with comparative constructions that might involve preferences: "I'd rather study now than later" uses "than" because it's comparing two options (studying now versus studying later). But "If I study now, then I can relax later" uses "then" because it's showing sequence and consequence.

❌ Incorrect: "She's smarter then her sister."

Why it's wrong: This sentence makes a comparison (smarter), so it needs the comparison word "than," not the time word "then."

✅ Correct: "She's smarter than her sister."

❌ Incorrect: "We'll go to the store, than head home."

Why it's wrong: This sentence describes a sequence of events (first store, next home), so it needs "then" for timing, not "than" for comparison.

✅ Correct: "We'll go to the store, then head home."

❌ Incorrect: "I'd rather stay home then go out in the rain."

Why it's wrong: "Rather" signals a comparison between two preferences (staying home vs. going out), so you need "than."

✅ Correct: "I'd rather stay home than go out in the rain."

❌ Incorrect: "If you're ready, than let's go."

Why it's wrong: "If...then" is a conditional construction showing consequence, not a comparison. Use "then" for the if/then pattern.

✅ Correct: "If you're ready, then let's go."

❌ Incorrect: "This task is easier then I thought."

Why it's wrong: "Easier" is a comparative adjective comparing the actual difficulty to the expected difficulty, so it needs "than."

✅ Correct: "This task is easier than I thought."

❌ Incorrect: "Back than, we didn't have smartphones."

Why it's wrong: "Back [word]" refers to a time in the past, so you need the time-related word "then," not the comparison word "than."

✅ Correct: "Back then, we didn't have smartphones."