If you have ever paused while writing a sentence, unsure whether to use complete or completed, you are dealing with a common grammar question involving verb tense and word function. While these two words are closely related, they are not always interchangeable. Here is a full breakdown of the difference and how to use each one correctly.
What Is the Basic Difference
Complete can function as both a verb and an adjective, while completed functions specifically as the past tense or past participle form of the verb complete. Choosing the right form depends on the tense and grammatical role within your sentence.
Quick Definition
| Word | Function |
|---|---|
| Complete | Verb (present tense) or adjective |
| Completed | Past tense or past participle verb form |
Example
As a verb (present tense): “Please complete the form before submitting it”
As past tense: “She completed the form yesterday”
Complete as a Verb
When used as a verb, complete means to finish something or make it whole. In its base form, it is typically used with helping verbs like will, can, or must, or in imperative sentences giving instructions.
Example Sentences
- “You must complete the assignment by Friday”
- “I will complete the project next week”
- “Please complete all required fields”
In each of these examples, complete functions as an action verb describing something that needs to happen, is happening, or will happen.
Complete as an Adjective
Complete can also function as an adjective, describing something that is whole, finished, or fully accomplished.
Example Sentences
- “The puzzle is complete”
- “This is a complete list of requirements”
- “Her presentation felt complete and well organized”
In these examples, complete describes a state or condition rather than an action being performed.
Completed as a Verb Form
Completed is used specifically as the past tense form of complete, describing an action that has already happened.
Example Sentences
- “She completed the marathon in record time”
- “The team completed the project ahead of schedule”
- “He completed his degree last spring”
Completed can also function as a past participle, often paired with helping verbs like has, have, or had, particularly in perfect tenses.
Example Sentences
- “I have completed the report”
- “They had completed the training before the deadline”
Complete and Completed Side by Side
Seeing these words compared directly clarifies exactly when each one applies.
| Sentence Using Complete | Sentence Using Completed |
|---|---|
| “Please complete the survey” | “She completed the survey yesterday” |
| “I need to complete this task today” | “I completed this task yesterday” |
| “The form is complete” | “The form was completed on time” |
Notice that complete often refers to an action happening now or in the future, or describes a finished state, while completed specifically refers to an action that has already taken place.
Understanding Verb Tense With Complete and Completed
To use these words correctly, it helps to understand which tense your sentence requires.
| Tense | Correct Form | Example |
|---|---|---|
| Present | Complete | “I complete my work every day” |
| Past | Completed | “I completed my work yesterday” |
| Future | Will complete | “I will complete my work tomorrow” |
| Present Perfect | Have completed | “I have completed my work” |
| Past Perfect | Had completed | “I had completed my work before the deadline” |
Common Mistakes to Avoid
Mistake One: Using Complete Instead of Completed for Past Actions
Incorrect: “She complete the assignment last night” Correct: “She completed the assignment last night”
Mistake Two: Using Completed Instead of Complete for Instructions or Present Actions
Incorrect: “Please completed the form before leaving” Correct: “Please complete the form before leaving”
Mistake Three: Confusing Adjective and Verb Forms
Incorrect: “The project is completed” (though understandable, this phrasing can sound slightly redundant depending on context)
More natural alternative: “The project is complete” (using complete as an adjective describing a finished state)
While “the project is completed” is grammatically acceptable, especially in passive voice constructions, many writers prefer “the project is complete” when simply describing the current finished state.
Complete vs Completed in Passive Voice
Completed often appears in passive voice sentences, where the subject receives the action rather than performing it.
Example Sentences
- “The report was completed by the team”
- “The building was completed in record time”
- “The application has been completed successfully”
In passive voice, completed functions as a past participle, working alongside forms of the verb to be, such as was, were, has been, or have been.
Complete vs Completed in Instructions and Forms
This is one of the most common areas of confusion, especially in professional or administrative writing, such as forms, applications, and instructions.
| Correct Usage | Example |
|---|---|
| Instructions (present tense) | “Complete all sections before submitting” |
| Describing finished status (past tense) | “This form was completed on March 3rd” |
Example in Context
“Please complete the attached form and return it once completed.”
This sentence correctly uses both words, complete as an instruction and completed to describe the finished state afterward.
Complete and Completed in Everyday Conversation
Both words appear frequently in daily conversation, depending on whether you are discussing something happening now or something that has already occurred.
Present or Instructional Examples
- “Can you complete this task for me”
- “I need to complete my chores before dinner”
Past Examples
- “I completed my chores an hour ago”
- “She completed her degree last year”
Complete as a Standalone Adjective vs Completed as a Descriptive Verb Form
Both words can describe a finished state, though they carry slightly different tones depending on context.
| Word | Tone |
|---|---|
| Complete | Often emphasizes wholeness or a finished state |
| Completed | Often emphasizes the action of finishing something |
Example Comparison
Emphasizing wholeness: “The collection is complete”
Emphasizing the action of finishing: “The collection was completed after years of work”
Quick Reference Table
| Word | Function | Example |
|---|---|---|
| Complete | Verb (present/instruction) | “Complete the checklist” |
| Complete | Adjective | “The checklist is complete” |
| Completed | Past tense verb | “She completed the checklist” |
| Completed | Past participle | “The checklist has been completed” |
Frequently Asked Questions
What is the main difference between complete and completed? Complete can function as a present tense verb or an adjective, while completed specifically refers to the past tense or past participle form of the verb.
Can complete be used to describe something that already happened? Not typically as a verb. For past actions, completed is the grammatically correct choice, though complete can still function as an adjective describing a finished state.
Is it correct to say the project is completed? Yes, this is grammatically correct, especially in passive voice, though many writers prefer the project is complete when simply describing its current finished state.
When should I use complete instead of completed in instructions? Use complete when giving instructions or describing something that should happen, such as complete the form, rather than completed, which describes something that has already occurred.
Can completed be used without a helping verb? Yes, particularly in simple past tense sentences, such as she completed the race, without needing an additional helping verb.
Final Thoughts
While complete and completed are closely related, they serve different grammatical purposes depending on tense and sentence structure. Complete functions as a present tense verb or adjective, often used in instructions or to describe a finished state, while completed specifically refers to the past tense or past participle form, describing an action that has already taken place. Understanding this distinction will help you choose the correct word confidently, whether you are writing instructions, describing a finished project, or discussing something that happened in the past.
