Since vs For: Choose by Start Point or Length of Time
In TOEIC Part 5, since and for often appear in sentences about work history, projects, employment, delays, service periods, and business changes.
The fast decision is not “Which word sounds better?” The fast decision is: does the sentence point to the time something started, or does it show how long the time lasted?
Core TOEIC rule: Use since for a start point. Use for for a length of time.
The 7-second choice
Since = start point
Use since when the sentence gives the point where the time began.
Signal: since 2021, since Monday, since the merger, since joining the company
For = length of time
Use for when the sentence gives the amount of time.
Signal: for three years, for two weeks, for several months, for a long time
The signal to remember
In TOEIC, the answer is often sitting very close to the blank. Look for the time expression after the answer choice.
The company has expanded its overseas sales since 2020.
Why: 2020 is the start point.
The company has expanded its overseas sales for four years.
Why: four years is the length of time.
The office has been closed since last Friday.
Why: last Friday is when it started.
The office has been closed for five days.
Why: five days is the time length.
What TOEIC wants you to notice
TOEIC often uses business time signals that look simple, but under pressure test-takers read too quickly and miss the difference.
Start point signals
2019, April, Monday, last year, the opening, the renovation, the new policy, joining the team
Length signals
three days, six months, ten years, several weeks, many years, a short period, a long time
Watch the small words
Some TOEIC sentences hide the clue inside a longer business sentence. Do not read the whole sentence in the same way. First find the time signal.
The accounting system has been updated regularly since the new manager arrived.
Decision: use since because the sentence points to the starting event.
The accounting system has been updated regularly for the past six months.
Decision: use for because the sentence gives the length of time.
Quick TOEIC check
Choose the option that matches the time signal. This is a micro-diagnostic, not a score test.
The mistake fast readers make
Fast readers often see a time word and choose by feeling. That is risky. Since and for are not decided by general time meaning. They are decided by the shape of the time signal.
Weak choice
“This sentence is about time, so either one might work.”
Better choice
“Is the word after the blank a start point or a length of time?”
Why this mistake returns under pressure
Since and for look easy during review. They become unstable during the test because the time signal is often short and familiar. Familiar words are easy to skip.
One-second tool: Start point = since. Length of time = for.
Use small TOEIC mistakes as a diagnostic
If you know since and for during study but miss them under time pressure, the problem may not be knowledge. It may be your checking pattern.
My TOEIC Coach helps test-takers notice these small decision habits and build a more reliable approach to Part 5.