Welsh Grammar for Beginners: Bod, Mutations, and Word Order First

Welsh grammar is not English grammar with different words. Adjectives come after nouns. The first letter of a word can change depending on what comes before it. "Yes" and "no" don't exist as standalone words. You answer with the verb. Numbers work differently depending on whether you're counting men or women.

None of this is harder than English. It's just unfamiliar. Welsh is actually remarkably consistent once you see the patterns. This guide covers what to learn first, in the order that makes the most sense for an adult learner.

Word Order: Verb First (Usually)

Like Irish and other Celtic languages, Welsh typically puts the verb first:

• Gwelodd y dyn y ci — Saw the man the dog (The man saw the dog)
• Darllenodd hi'r llyfr — Read she the book (She read the book)

However, spoken Welsh overwhelmingly uses a construction with bod (to be) + yn + verbal noun, which resembles English word order more closely:

• Mae'r dyn yn gweld y ci — Is the man seeing the dog (The man sees the dog)
• Mae hi'n darllen y llyfr — Is she reading the book (She's reading the book)

This periphrastic (roundabout) construction is the one you'll use most in everyday Welsh. The inflected verb-first form is more literary and formal.

Bod (To Be). The Most Important Welsh Verb

Bod is the verb you'll use more than any other. It's irregular and has different forms depending on tense, person, and whether you're making a statement, asking a question, or negating.

Present tense, statements:

• Dw i — I am
• Rwyt ti — You are (informal)
• Mae e/o — He is / Mae hi — She is
• Dyn ni — We are
• Dych chi — You are (formal/plural)
• Maen nhw — They are

Questions use different forms:

• Ydw i? — Am I?
• Wyt ti? — Are you?
• Ydy e/hi? — Is he/she?
• Ydyn ni? — Are we?
• Ydych chi? — Are you?
• Ydyn nhw? — Are they?

Negatives use yet another set:

• Dw i ddim — I am not
• Dwyt ti ddim — You are not
• Dydy e/hi ddim — He/she is not

This is a lot of forms for one verb, but bod is the foundation of most Welsh sentences. Time spent mastering it pays off immediately.

Nouns and Gender

Every Welsh noun is masculine (gwrywaidd) or feminine (benywaidd). Gender matters because it triggers mutations after the article and affects numbers and adjective forms.

Some patterns:

• Feminine: countries, rivers, towns (usually), abstract nouns ending in -aeth or -es
• Masculine: most concrete objects, days, months, metals

With the article y/yr/'r, feminine singular nouns undergo soft mutation:

• cath (cat) → y gath (the cat) — because cath is feminine
• ci (dog) → y ci (the dog) — because ci is masculine, no change

Mutations (Treigladau). The Big One

Welsh has three mutations that change the first letter of a word depending on what comes before it. Mutations are probably the single biggest challenge for English speakers learning Welsh.

Treiglad meddal (soft mutation)

The most common mutation. Nine consonants change:

Key triggers: ei (his), the article with feminine nouns, prepositions (i, o, am, ar, gan, heb, wrth, dan, dros, trwy), and adjectives after feminine singular nouns.

For the full details on all three mutations, see our complete Welsh mutations guide.

Plurals. Welsh's Other Challenge

Welsh plurals are irregular in ways English speakers don't expect. There's no single rule like "add -s." Instead, Welsh has dozens of plural patterns:

• Suffix: cath → cathod (cats), ci → cŵn (dogs)
• Vowel change: car → ceir (cars)
• Both: plentyn → plant (children)
• Collective + singulative: coed (trees/wood) → coeden (a single tree). The "plural" is the base form and you add -en for one.

The collective/singulative pattern trips up English speakers most. Words like adar (birds), plant (children), coed (trees) are already plural. You add -yn or -en for the singular: aderyn (a bird), plentyn (a child), coeden (a tree).

Answering Questions: No "Yes" or "No"

Welsh has no single word for "yes" or "no." You answer with the verb from the question:

• Wyt ti'n hapus? (Are you happy?) → Ydw (I am) or Nac ydw (I am not)
• Ydy hi'n bwrw glaw? (Is it raining?) → Ydy (It is) or Nac ydy (It is not)

Prepositions Conjugate

Like Irish, Welsh prepositions merge with pronouns into single words:

• ar (on) → arna i (on me), arnat ti (on you), arno fe (on him), arni hi (on her)
• i (to) → i mi, i ti, iddo fe, iddi hi

Several common expressions use conjugated prepositions: Mae pen tost arna i (I have a headache. Literally "there is a sore head on me").

Where to Start

1. Bod (to be). Present tense statements, questions, negatives. This is the foundation of most Welsh sentences.
2. Basic vocabulary. 200-300 most common words.
3. Soft mutation triggers. Start with the most common: feminine nouns after the article, ei (his), and prepositions.
4. Past tense of bod. Roedd, Roeddwn i.
5. Common preposition forms. arna i, gen i, i mi.

Don't try to master all three mutations at once. Soft mutation alone covers 80% of what you'll encounter. Get that solid first, then add nasal and aspirate later.