Usage of for, since, while, during

Understanding the Prepositions for, since, while and during

When learning English, prepositions that express time often cause confusion. The four most common temporal prepositions—for, since, while and during—each have a specific function. Mastering them will improve both spoken fluency and written accuracy, and it will also boost your performance on quizzes and exams.

When to Use since

Since marks the starting point of an action or state that continues up to the present moment. It is always paired with the present perfect (or present perfect continuous) tense.

• Use since with a specific point in time: since 2012, since Monday, since 8 a.m.
• Do not use it with a duration (e.g., *since two weeks* is incorrect).

Example: I have lived in this city since 2012.

When to Use for

For expresses a length of time. It is also used with the present perfect (or present perfect continuous) to indicate how long something has lasted.

• Combine for with a period: for two weeks, for three years, for a long time.
• It cannot be used with a specific start date; that is the job of since.

Example: She hasn’t practiced for at least two weeks.

When to Use while

While links two actions that happen simultaneously. It is a conjunction rather than a simple preposition, so it introduces a clause, not just a noun phrase.

• Use it when two events overlap in time: while I was cooking, the phone rang.
• It is not used with a single point in time; it always refers to a period.

Example: They called again while I was commuting back from work.

When to Use during

During points to a specific event or period in which something else occurs. It is often followed by a noun that names an event, a season, or a broader time frame.

• Typical collocations: during the night, during the meeting, during my stay.
• It does not indicate a precise start or end; it simply says “in the middle of”.

Example: He watched TV during the whole night.

Key Differences at a Glance

• Since = start point (specific date or moment).
• For = duration (how long).
• While = two actions happening at the same time (clause).
• During = something occurring inside a larger event or period.

Common Mistakes and How to Avoid Them

Mixing since and for

Students often write *"I have lived here for 2015"* or *"I have lived here since three years"*. Remember:

• Use since with a point: *since 2015*.
• Use for with a span: *for three years*.

Using while as a preposition

Because while is a conjunction, it must be followed by a verb phrase, not a noun. Incorrect: *"I studied while the night"*. Correct: *"I studied while the night was quiet"* or *"I studied during the night"*.

Choosing between during and while

If you can replace the phrase with *"throughout the period of"*, during is likely the right choice. If you can rewrite it as two parallel clauses, while fits better.

Practical Tips for Learners

• Identify whether the sentence needs a point or a duration. That will immediately narrow the choice to since or for.
• Look for a noun that names an event (meeting, night, stay). That signals during.
• When two actions occur together, think of a clause with a subject and verb; while is the connector.
• Practice by converting sentences: change a for sentence into a since sentence by adding a specific start date, and vice‑versa.

Quiz Review: Applying What You’ve Learned

Below are the original quiz items that inspired this course. Review each question, recall the rule, and then check the correct answer.

• 1. Which preposition correctly completes: "I’ve studied in this university … 2012"?
  
  • since (correct)
  • while
  • during
  • for
• 2. Choose the appropriate word: "We’ve been to the same place … I was a child".
  
  • while
  • since (correct)
  • for
  • during
• 3. Fill the blank: "Obviously, she hasn’t practiced … at least two weeks."
  
  • since
  • while
  • for (correct)
  • during
• 4. Select the correct preposition: "I haven’t stopped sending you text messages … you left, actually."
  
  • during
  • while
  • for
  • since (correct)
• 5. Which word fits: "Dinner’s been served … almost an hour"?
  
  • since
  • for (correct)
  • during
  • while
• 6. Choose the correct conjunction: "I met him … my stay in New‑York."
  
  • while
  • since
  • for
  • during (correct)
• 7. Select the appropriate word: "He watched TV … the whole night."
  
  • since
  • for
  • while
  • during (correct)
• 8. Complete the sentence: "They called again … I was commuting back from work."
  
  • since
  • for
  • during
  • while (correct)

Additional Practice Sentences

Try filling the blanks yourself before checking the answers.

1. I have been waiting _____ 9 a.m. (use since).
2. She lived in Paris _____ five years before moving to London (use for).
3. We chatted _____ the movie was playing (use while).
4. He fell asleep _____ the lecture (use during).

Answers: 1) since, 2) for, 3) while, 4) during.

Summary

Choosing the right temporal preposition hinges on three questions:

1. Is the focus a starting point? → since.
2. Is the focus a length of time? → for.
3. Are we describing simultaneous actions or an event occurring inside a larger period? → while for simultaneous clauses, during for events within a period.

By internalising these patterns, you will write clearer sentences, avoid common errors, and feel more confident in both academic and everyday English.

Further Reading and Resources

• Oxford Learner's Dictionaries – since
• Oxford Learner's Dictionaries – for
• Oxford Learner's Dictionaries – while
• Oxford Learner's Dictionaries – during