'to' + non-base form

When "to" marks the infinitive, it must be followed by the base verb: to + base (to go, to write, to sing). Common slips like "to went" or "to finished" are wrong unless "to" is a preposition (as in look forward to + -ing).

Below: a quick rule, clear exceptions, many short wrong/right pairs (work, school, casual), rewrite templates, and fast proofreading checks you can copy.

Quick answer

If "to" is the infinitive marker, use the base verb: to + base. Don't use past or past-participle forms after that "to". Exceptions occur when "to" is a preposition (to + -ing in phrases like look forward to) or when you need auxiliaries (to have finished, to be invited).

Correct (infinitive): She wants to go. - Wrong: She wants to went.
Prepositional to + gerund: I'm used to getting up early.
If you see to + -ed, ask: is "to" an infinitive marker or a preposition? If infinitive, switch to the base form or add an auxiliary.

Core rule - when "to" needs the base verb

"To" as an infinitive marker takes the base verb: to + base (to write, to call, to finish). If you spot "to" + a past form (went, finished, sung), check whether "to" is the infinitive; if it is, use the base or add an auxiliary.

Infinitive marker: to + base (to eat, to read).
Wrong pattern: "to" followed directly by an -ed or irregular past without an auxiliary.
Wrong: She wants to went to the meeting. -
Right: She wants to go to the meeting.

Grammar exceptions: prepositional "to", auxiliaries, and participles

Not every "to" before a verb is the infinitive marker. When "to" is a preposition (look forward to, be used to), it takes a noun or a gerund (to + -ing). When a perfect or passive sense is required, use auxiliaries: to have finished, to be chosen.

Prepositional to: look forward to meeting you (to + gerund).
Perfect infinitive: to have finished the task.
Passive infinitive: to be chosen (not to chosen).
Usage: I'm used to waking up at 6. - Usage: She hopes to have finished the draft by Friday.

Spacing and hyphenation - visual traps that hide errors

Missing spaces or stray hyphens can mask mistakes. Check spacing around "to" and avoid hyphenating the infinitive: use "to go," not "to-go," unless you're using a fixed compound adjective like "a to-go order."

Wrong spacing: "I'm going togo tomorrow." → Correct: "I'm going to go tomorrow."
Wrong hyphen: "She plans to-move next week." → Correct: "She plans to move next week."
Wrong: Order is to-go prepared. -
Right: A to-go order (or: The order is to be prepared to go).

Fix quickly without losing your voice

Most fixes are one-word swaps: went → go, finished → finish. Use a short checklist while editing: identify "to" type, pick base or gerund, add auxiliaries when needed. These small edits keep your tone and clarity intact.

Quick step: spot "to + -ed" → is it an infinitive? If yes, change to base or add "have" / "be".
Keep templates handy and apply them in emails, essays, or posts.

Real usage and tone - when errors matter most

Correct infinitives matter in professional and academic writing; in casual chat a slip may pass but can confuse readers. Prioritize fixes where meaning or formality is affected.

Professional: fix "to + non-base" in action items and deadlines.
Casual: correct when the sentence becomes unclear or you want to sound polished.
Formal - Wrong: We need to finalized the report by Friday. - Right: We need to finalize the report by Friday.
Casual - Wrong: I'm going to gone now. -
Right: I'm going to go now.

Try your own sentence

Test the whole sentence rather than the isolated phrase. Context often shows whether "to" is a preposition or an infinitive marker.

Examples - quick wrong/right pairs (general, work, school, casual)

Read the wrong sentence, then the corrected version. Use these as quick edits when proofreading.

If "to" is followed by -ed without an auxiliary, change to the base or add the auxiliary.
Ask: Did I mean an action (base verb) or a noun/gerund?

General - Wrong: I love to singed. - Right: I love to sing.
General - Wrong: We tried to answered the question. - Right: We tried to answer the question.
General - Wrong: I need to updated the file. - Right: I need to update the file.
Work - Wrong: Please try to contacted the client before noon. -
Right: Please try to contact the client before noon.
Work - Wrong: They promised to sent the invoice today. -
Right: They promised to send the invoice today.
Work - Wrong: We need to finalized the budget by Monday. -
Right: We need to finalize the budget by Monday.
School - Wrong: She decided to studied biology next semester. -
Right: She decided to study biology next semester.
School - Wrong: The teacher asked us to submitted our essays by Monday. -
Right: The teacher asked us to submit our essays by Monday.
School - Wrong: He hopes to graduated in June. -
Right: He hopes to graduate in June.
Casual - Wrong: I want to danced all night. -
Right: I want to dance all night.
Casual - Wrong: I'm planning to moved next month. -
Right: I'm planning to move next month.
Casual - Wrong: She's going to gone tomorrow. -
Right: She's going to go tomorrow.

Rewrite help - step-by-step checks and ready-to-use rewrites

Three-step check: (1) Is "to" an infinitive marker or a preposition? (2) If infinitive, replace the following verb with its base form. (3) If you need perfect or passive sense, add the auxiliary (have, be).

Test by replacing "to" with "in order to." If it works, use the base verb.
If "to + -ed" expresses past meaning, rewrite the clause (He went / He wanted to go).

Rewrite:
Original: To enjoyed the concert was my goal. ⇒ My goal was to enjoy the concert.
Rewrite:
Original: He wants to studying abroad. ⇒ He wants to study abroad.
Rewrite:
Original: I want to to learned more about coding. ⇒ I want to learn more about coding.
Rewrite:
Original: She seemed to tired after the trip. ⇒ She seemed tired after the trip. (Or: She seemed to be tired after the trip.)

Memory tricks and fast checks

Two quick metaphors: think of "to" as a doorway that admits base-form guests (to go, to call), or as a bridge (prepositional) that takes -ing nouns (getting, meeting).

Fast check: insert "in order" after "to." If the sentence still makes sense, you want the base verb.

Doorway = infinitive → base verb.
Bridge = preposition → gerund (to + -ing).
If you expected past meaning, put the past tense in a separate clause: He went / He wanted to go.

Similar mistakes to watch for

Errors often overlap with infinitive vs. gerund confusion, omitted auxiliaries, and misreading expressions like used to. Spotting these helps you choose the right fix.

Omitting auxiliaries: avoid "to finished" - use "to have finished" for the perfect infinitive.
Used to vs. be used to: "I used to smoke" (past habit) vs. "I'm used to smoking" (accustomed to + gerund).
Gerund vs. infinitive differences: some verbs change meaning depending on -ing or to + base (remember doing vs remember to do).
Wrong: She seemed to tired. -
Right: She seemed tired (or: She seemed to be tired).
Wrong: I used to getting up early. -
Right: I'm used to getting up early.

FAQ

Why can't I use "went" after "to"?

If "to" is the infinitive marker it requires the base form. "Went" is past tense and cannot follow the infinitive. To show past meaning, rewrite the clause (He went; He wanted to go).

When is "to" followed by -ing?

When "to" is a preposition inside a phrase (look forward to, be used to), it takes a gerund (-ing). Identify whether "to" is a preposition or an infinitive marker first.

What if I meant a perfect or passive sense?

Add the correct auxiliary: perfect infinitive = to have + past participle (to have finished); passive infinitive = to be + past participle (to be invited). Avoid "to finished" or "to invited".

Quick proofreading tip for spotting these mistakes?

Search for "to " followed by a word ending in -ed or an irregular past. Ask: was the writer marking the infinitive? If yes, change to base or add an auxiliary. If "to" is part of a phrasal/prepositional structure, keep -ing.

Can automated checkers fix all of these mistakes?

Most checkers catch many "to + non-base" patterns and suggest fixes, but they can miss context (prepositional vs infinitive). Use the three-step check when a suggestion looks wrong.

Want to check a sentence now?

Paste your sentence into a checker or scan for any "to" followed by -ed. Often the fix is one small change. For automated suggestions and explanations, try a grammar checker that highlights "to + non-base" patterns and offers rewrites.