In short

The past (lesson 21) hung its person-markers on the end of the stem. The future does the opposite: it marks person mainly with a prefix — א / ת / י / נ (e / t / y / n) glued to the front — and adds a small ending only in a couple of forms. So on the same root כ־ת־ב (k-t-v, “write”) you get אכתוב (ekhtov, “I’ll write”), תכתוב (tikhtov, “you/she will write”), יכתוב (yikhtov, “he’ll write”), נכתוב (nikhtov, “we’ll write”).

This is the strong pa’al future — the everyday tool for plans, predictions, and (in the 2nd person) polite suggestions in Modern Hebrew: מחר נשמור על הבית (machar nishmor al ha-bayit, “tomorrow we’ll watch the house”), תסגור בבקשה את הדלת (tisgor bevakasha et ha-delet, “please close the door”). We stay on the strong (שלמים, shlemim) roots from lesson 21; weak roots and the other binyanim come later.

The rule

• Person is a prefix here, not a suffix. Four prefix letters carry “who”: א (1sg, “I”), ת (2nd person and 3f.sg), י (3m.sg and 3rd plural), נ (1pl, “we”). Two vowel-endings then split the forms further: ־י (-i) marks the 2f.sg, and ־ו (-u) marks the plural. Everything is prefix + stem (+ ending).

• The stem is the same strong consonant frame you already know. For an o-theme verb the future stem is ־כתוב־ (-ktov): prefix it and you get ekhtov / tikhtov / yikhtov / nikhtov. The three root letters never change; only the front (and sometimes the tail) does.

• The theme vowel is o for the default class — spelled with ו. In ktiv male the o sits as a ו between the 2nd and 3rd radicals: יכתוב (yikhtov), תשמור (tishmor), יסגור (yisgor), יגמור (yigmor). Learn the 3m.sg יכתוב as the peg and re-prefix it for the others.

• The 1sg prefix is e, the other three are i. It is אכתוב (ekhtov), not *ikhtov — the א-prefix takes an e vowel. The ת / י / נ prefixes take i: tikhtov, yikhtov, nikhtov. Mixing this up (*ikhtov, or the very common *אני יכתוב) is the classic slip.

• The theme vowel drops before a vowel ending — and its ו drops with it. Add ־י (2f.sg) or ־ו (plural) and the o falls out: תכתוב → תכתבי (tikhtov → tikhtevi), יכתוב → יכתבו (yikhtov → yikhtevu). Note the spelling: the ו that wrote the o disappears (תכתבי, not *תכתובי). Keep no o here — it is tikhtevi / yikhtevu, never *tikhtovi / *yikhtovu.

• A begadkefat first radical softens after the prefix vowel. Because the prefix ends in a vowel, a ב / כ / פ starting the root goes soft: כתב → יכתוב (yikhtov, not *yiktov), בדק → יבדוק (yivdok), פתח → יפתח (yiftach). This is automatic — don’t hard-pronounce the first radical.

• A second class takes a instead of o — typical of guttural roots. When the middle or last radical is a guttural (ח / ע / ה / א), the theme vowel is usually a: ש־מ־ע → ישמע (yishma), פ־ת־ח → יפתח (yiftach). A few high-frequency non-guttural verbs pattern the same way, above all ל־מ־ד → ילמד (yilmad, “he’ll learn”). The a drops before a vowel ending exactly like the o: ילמד → ילמדו (yilmad → yilmedu), ישמע → ישמעו (yishma → yishme’u).

• תכתוב is two people at once. With no niqqud (and none even spoken to help), תכתוב (tikhtov) is both 2m.sg “you (m) will write” and 3f.sg “she will write”. The pronoun or context tells them apart — אתה תכתוב vs. היא תכתוב — just like the past collisions in lesson 21.

• No literary feminine-plural, no cohortative. Modern Hebrew has no תכתובנה / תכתבנה feminine-plural: the masculine-plural תכתבו / יכתבו covers women too. And there is no cohortative ־ה on the 1sg — it is אשמור (eshmor), never the biblical *אשמרה. The plural is always ־ו for both genders.

Forms & patterns

The full pa’al future on כ־ת־ב (write) — o-theme:

The prefixes and endings, stripped bare (this set is the same for every strong pa’al verb):

The a-theme (guttural) class on ל־מ־ד (learn):

Two more a-theme verbs with a real guttural: ש־מ־ע → ישמע (yishma), plural ישמעו (yishme’u); פ־ת־ח → יפתח (yiftach), plural יפתחו (yiftechu).

The reduction, up close — the theme vowel drops before a vowel ending:

Past vs. future: where the person-marker lives (root כ־ת־ב):

Examples

Common mistakes

• אכתוב (ikhtov) -> אכתוב (ekhtov) - the 1sg א-prefix takes an e, not an i.
• אני יכתוב -> אני אכתוב (ekhtov) - 1sg uses the א-prefix; *יכתוב (yikhtov) is “he will write”.
• תכתובי (tikhtovi) -> תכתבי (tikhtevi) - the theme o drops before ־י, and its ו drops in spelling too.
• יכתובו (yikhtovu) -> יכתבו (yikhtevu) - same drop before the plural ־ו: no o, no ו.
• תכתובנה -> תכתבו (tikhtevu) - Modern Hebrew has no feminine-plural form; the ־ו plural covers women as well.
• אשמרה (cohortative) -> אשמור (eshmor) - no biblical ־ה on the 1sg; the plain future is eshmor.
• הוא ילמוד (yilmod) -> הוא ילמד (yilmad) - ל־מ־ד is an a-theme verb, so its future is yilmad, not the o-pattern *yilmod.
• הוא יכתוב (yiktov) -> הוא יכתוב (yikhtov) - the begadkefat כ softens after the prefix vowel: it’s yikhtov, not yiktov.

Tips

• Build every form as prefix + stem (+ ending). Memorize the four prefixes א / ת / י / נ and the two endings ־י (2f.sg) and ־ו (plural), and the rest is automatic.
• Fix the prefix vowels: e for the 1sg (ekhtov, elmad), i for the other three (tikhtov, yikhtov, nikhtov). The stray *ikhtov and *אני יכתוב are the two most common errors.
• Before a vowel ending the theme vowel drops: tikhtov → tikhtevi, yikhtov → yikhtevu (o-theme), yilmad → yilmedu (a-theme) — and in the o-theme the written ו drops with it.
• A begadkefat first radical goes soft after the prefix: כתב → yikhtov, בדק → yivdok, פתח → yiftach. Don’t hard-pronounce it.
• תכתוב (tikhtov) is both “you (m) will write” and “she will write” — lean on the pronoun to tell them apart, exactly as with the unvocalized past.
• In everyday MIH the 2nd-person future doubles as a soft request or suggestion: תסגור בבקשה את הדלת (“please close the door”). The true imperative comes in lesson 38.
• Anchor a plan or prediction with a time word — מחר (machar, “tomorrow”), בשבוע הבא (ba-shavua ha-ba, “next week”), אחר כך (achar kach, “afterwards”) — to keep yourself in the future.
• Never add a feminine-plural or a 1sg ־ה: the plural is always ־ו for both genders, and there is no cohortative in Modern Hebrew.