He what (would) do it again

Writers and speech-to-text tools sometimes produce "what" where the modal "would" belongs. That swap breaks conditionals, polite phrasing, and past-habit narration.

Quick check: if a clause is hypothetical, tentative, polite, or describes a repeated past action, use would. Below are clear rules, many ready-to-use fixes for work, school, and casual lines, short rewrite templates, and memory tricks.

Quick answer

Use would when the sentence expresses a hypothetical result, a polite preference, or a past habitual action. Keep what only when it is a question word or a pronoun/determiner.

Conditional/hypothetical: use would (If I won, I would go).
Politeness/preferences: would softens statements (I would prefer...).
Past habitual narration: would can describe repeated past actions (He would arrive late every Friday).
Keep what for questions and content uses (What did you say?).

Core grammar: when would belongs

Would is a modal auxiliary that marks hypotheticals, polite/conditional statements, and some narrative past habits. What is a content word (question word or pronoun) and never serves as a modal.

If a clause expresses possibility, preference, a tentative outcome, or a recurring past action, you usually need would - not what.

Hypothetical/conditional: would + base verb (She would help if asked).
Perfect conditional: would have + past participle (He would have told you).
Past habit (narrative): would + verb (When they were kids, she would hide notes).

Real usage and tone: how would changes meaning

Would makes a statement tentative or conditional. Will indicates a definite future. Would and used to can both describe past repetition, but used to is more neutral; would has a storytelling tone.

Contractions affect tone and clarity. I'd or he'd suit casual writing; spell out would in formal contexts to avoid ambiguity (he'd can mean had or would).

Would = hypothetical/tentative or polite. Will = certain/future.
Contractions: I'd = I would (informal). He'd may mean he had or he would - check the verb that follows.
Example: I would finish the report by Friday (conditional). I will finish the report by Friday (definite plan).

Context examples: work, school, casual - wrong → right (copy any corrected line)

Common speech-to-text or typing errors replace would with what. Each pair below shows the incorrect line and the corrected version.

Wrong: John what sign the contract without checking. →
Right: John would sign the contract without checking.
Wrong: If the client calls, she what answer. →
Right: If the client calls, she would answer.
Wrong: They what postpone the meeting again. →
Right: They would postpone the meeting again.
Wrong: When exams came, he what study late into the night. →
Right: When exams came, he would study late into the night.
Wrong: If you asked her nicely, she what explain the solution. →
Right: If you asked her nicely, she would explain the solution.
Wrong: The TA what return the papers on Friday. →
Right: The TA would return the papers on Friday.
Wrong: I what go if you need a ride. →
Right: I would go if you need a ride.
Wrong: He what always bring snacks to the movie nights. →
Right: He would always bring snacks to the movie nights.
Wrong: Who what think she'd show up? →
Right: Who would think she'd show up?

Quick bank: compact wrong → right pairs (perfect conditionals, questions, contractions)

Wrong: He what have told you earlier. →
Right: He would have told you earlier.
Wrong: I what help you tomorrow. →
Right: I would help you tomorrow.
Wrong: She what say yes if you ask. →
Right: She would say yes if you asked.
Wrong: Who what be responsible? →
Right: Who would be responsible?
Wrong: They what accept the offer. →
Right: They would accept the offer.
Wrong: What'd you do? (ambiguous) →
Right: What would you do? / What did you do?
Wrong: He what've known. →
Right: He would have known.
Wrong: I'd what help (speech error) →
Right: I'd help / I would help.

Try your own sentence

Test the whole sentence, not just the phrase. Context usually makes the correct choice obvious.

Rewrite help: step-by-step fixes and ready templates

Follow this mini-process: (1) Confirm the clause is conditional/hypothetical/polite/past-habit. (2) Replace what → would. (3) Use would have for perfect conditionals. (4) Pick a contraction only for informal tone.

Checklist: Identify conditional? Replace what with would. Switch to would have + past participle if needed. Avoid contractions in formal writing.
Template (conditional): If + past simple, subject + would + base verb.
Template (polite): I would + base verb / I would prefer + noun/infinitive.

Rewrite 1: Original: "She what probably call later." → "She would probably call later."
Rewrite 2: Original: "I what prefer to meet at 2." → "I would prefer to meet at 2." (
casual: "I'd prefer to meet at 2.")
Rewrite 3: Original: "He what be the one to blame, I guess." → "I guess he'd be the one to blame."
Rewrite 4: Original: "If you hurry, she what finish on time." → "If you hurry, she would finish on time."

Hyphenation, spacing, contractions, and speech-to-text traps

Speech recognizers often mishear would as what in noisy audio or fast speech. Common slip-ups: adding a space in contractions (he 'd) or using ambiguous contractions (what'd, who'd).

Speech-to-text trap: replay the clip or retype slowly when you see "what" where would fits.
Contraction spacing: write she'd, he'd (no space).
Avoid ambiguous contractions like what'd and who'd in formal writing; spell out the modal or the past verb.
Hyphenation: use would-be as an adjective before a noun (a would-be manager) but not for verb phrases (she would be manager).

Memory trick: three fast tests to avoid the swap

If → Then test: Add an If clause (If I had time...) and see whether the result clause uses would. If it does, use would.
Swap-and-read: Replace what with would and read it aloud. If the meaning clears up, keep would.
Contraction check: Try the contraction (I'd, he'd). If it fits the tone and meaning, a contraction is okay in casual writing; spell out would in formal contexts.

Practice aloud: "If I had the map, I would go" helps you feel the modal.

Similar mistakes to watch for (would vs will, used to, and ambiguous 'd')

Confusions cluster around other modals and contractions. Would ≠ will; used to and would can both describe past habits; 'd can represent had or would depending on what follows.

Would vs will: "I would go" (conditional) vs "I will go" (planned).
Would vs used to: "He used to smoke" (past habit) vs "He would smoke" (narrative habit in a story).
Ambiguous 'd: if a past participle follows ("He'd gone") it usually means had; if a base verb follows ("He'd go") it means would.

FAQ

Why do people write "He what do it again" instead of "He would do it again"?

Most often it's a typing or speech-to-text error, or confusion from contractions. The sentence is conditional; replace what with would to restore the intended meaning.

When is what correct instead of would?

What is correct when it's a question word or a pronoun (What did she say?). It's not a modal; use would for hypotheticals, polite statements, or narrative past habits.

How can I remember when to use would?

Use the If → Then test: add an If clause and see whether the result clause naturally uses would (If I had time, I would go). If it does, use would.

Is it okay to use contractions like he'd in formal writing?

Avoid contractions in formal writing. Spell out would (he would) to reduce ambiguity-he'd can mean he had or he would.

Will grammar checkers catch "what" used instead of "would"?

Many grammar checkers flag this because what rarely functions as a modal. Still, review suggestions-context decides whether would is the right replacement.

Fix one sentence now

If a sentence contains what where you'd expect a modal, run the quick checklist: identify conditional meaning, replace what → would, adjust tense if needed, and read the sentence aloud. A single-word change usually restores the intended conditional or polite sense.