In short

To say how something happens, Modern Hebrew has no single “-ly” ending like English. Instead it uses three tricks. The most productive is the prefix ב־ (be-, “in/with”) glued to an abstract noun: from זהירות (zhirut, “caution”) you get בזהירות (bizhirut, “carefully”), from מהירות (mehirut, “speed”) you get במהירות (bimhirut, “quickly”). The second trick is to grab the plain masculine-singular adjective and use it, unchanged, as an adverb — מהר (maher, “fast”), קשה (kashe, “hard”), טוב (tov, “well”). The third is a short list of built-in adverbs like לאט (le’at, “slowly”).

The one thing all of these share: an adverb never inflects. It does not copy the gender or number of anything — הוא עובד קשה (hu oved kashe) and היא עובדת קשה (hi ovedet kashe) keep the very same קשה. On top of these, a handful of degree and frequency words (מאוד “very”, קצת “a bit”, תמיד “always”, אף פעם “never”) turn the dial up or down — and each one has a usual spot, before or after the word it scales.

The rule

Strategy 1 — ב־ + an abstract noun makes a manner adverb. Take the “-ness / -ion” noun and prefix ב־ (be-, written with no space): זהירות (zhirut) → בזהירות (bizhirut, “carefully”), מהירות (mehirut) → במהירות (bimhirut, “quickly”), שקט (sheket, “quiet”) → בשקט (besheket, “quietly”), קלות (kalut, “ease”) → בקלות (bekalut, “easily”). This is the go-to pattern whenever a matching abstract noun exists: הוא נוהג בזהירות (hu noheg bizhirut, “he drives carefully”).

Strategy 2 — the bare masculine-singular adjective, used as an adverb, does NOT agree. A small but very common set of adjectives double as adverbs in their plain (masc-sg) shape: מהר (maher, “fast”), קשה (kashe, “hard”), טוב (tov, “well”), יפה (yafe, “nicely”). Crucially the adverb stays frozen no matter who the subject is: הם עובדים קשה (hem ovdim kashe, “they work hard”), היא שרה יפה (hi shara yafe, “she sings nicely”). Do not give it a feminine ־ה or plural ending — that would turn it back into an agreeing adjective.

Strategy 3 — native, unanalysable adverbs. A few manner words are just adverbs in their own right: לאט (le’at, “slowly”), and the literary היטב (heitev, “well”). In everyday speech “well” is טוב (tov); היטב belongs to careful writing (register: lesson 60).

Degree words scale an adjective or adverb — and position is fixed. מאוד (me’od, “very”) and מדי (miday, “too”) come after the word: יפה מאוד (yafe me’od, “very nice”), יקר מדי (yakar miday, “too expensive”). The others come before it: די (dai, “quite”), ממש (mamash, “really”), קצת (ktzat, “a bit”), מספיק (maspik, “enough”) — די טוב (dai tov), ממש טוב (mamash tov), קצת קר (ktzat kar), מספיק גדול (maspik gadol). Putting מדי on the wrong side (מדי יקר) sounds foreign; מאוד is looser (see below).

Put מאוד after the word by default. Careful, written Hebrew places מאוד after the word it intensifies: יפה מאוד (yafe me’od). Everyday speech also puts it in front, before adjectives and verbs alike (מאוד יפה, me’od yafe; אני מאוד אוהב, ani me’od ohev), so you will hear both; after the word is the safe choice.

Frequency adverbs sit before the verb (or open the sentence). תמיד (tamid, “always”), לפעמים (lif’amim, “sometimes”), בדרך כלל (bederech klal, “usually”): הוא תמיד עוזר לי (hu tamid ozer li, “he always helps me”), לפעמים אני שוכח (lif’amim ani shokhe’ach, “sometimes I forget”).

אף פעם (“never”) demands a second לא. Like the negative-scope words of lesson 24, אף פעם cannot negate alone — Hebrew uses negative concord, so a לא must also stand before the verb: היא אף פעם לא מאחרת (hi af pa’am lo me’acheret, “she is never late”). Dropping the לא — היא אף פעם מאחרת — is ungrammatical, even though English has no second “not”.

Forms & patterns

Three ways to build a manner adverb:

Degree words — by position:

Frequency adverbs:

One adverb, every subject — no agreement:

Examples

Common mistakes

• היא שרה טובה -> היא שרה טוב (hi shara tov) - an adverb never agrees; keep the bare masc-singular טוב even with a feminine subject.
• היא רצה מהרה -> היא רצה מהר (hi ratza maher) - מהר is invariable; don’t give it a feminine ־ה ending.
• היא אף פעם מאחרת -> היא אף פעם לא מאחרת (hi af pa’am lo me’acheret) - אף פעם needs the concord לא (double negation), just like the scope-words in lesson 24.
• הם עובדים קשים -> הם עובדים קשה (hem ovdim kashe) - a plural subject changes nothing either: the adverb takes no ־ים ending.
• זה מדי יקר -> זה יקר מדי (ze yakar miday) - מדי also comes after the adjective, not before it.
• הוא נוהג זהיר -> הוא נוהג בזהירות (hu noheg bizhirut) - build the manner adverb from ב־ + the abstract noun, not from the bare adjective זהיר.
• היא מדברת במהר -> היא מדברת מהר (hi medaberet maher) - מהר is already an adverb; don’t add the ב־ prefix.

Tips

• Three ways to say “how”: ב־ + abstract noun (בזהירות), the bare masc-sg adjective (מהר, קשה, טוב), or a native adverb (לאט). All three stay frozen — no gender, no number.
• Whatever the subject, the adverb doesn’t move: הוא עובד קשה / היא עובדת קשה / הם עובדים קשה. Only the verb agrees; the adverb never does.
• Fix the degree positions by ear: מאוד and מדי go AFTER (יפה מאוד, יקר מדי); די, ממש, קצת, מספיק go BEFORE (די טוב, ממש טוב, קצת קר, מספיק גדול).
• Default to מאוד after the word, especially in writing. Speech also puts it in front (מאוד יפה, אני מאוד אוהב), so expect to hear both orders.
• Treat אף פעם as a magnet for לא — “never … not” — exactly the negative concord you met with אף אחד and שום דבר.
• היטב is bookish “well”; in everyday speech just say טוב. Save היטב for formal writing.
• Frequency words — תמיד, לפעמים, בדרך כלל — sit comfortably before the verb or right at the front of the sentence.
• When a “careful / quick / quiet” adjective exists, the adverb is usually ב־ + its noun: זהיר → בזהירות, מהיר → במהירות, שקט → בשקט.