Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
I was a sub
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "I was a sub" is correct and usable in written English.
It can be used in contexts where someone is referring to their role as a substitute teacher or in certain communities where "sub" refers to a submissive partner in a relationship. Example: "During my time in college, I was a sub for several classes, helping out the main teacher when needed."
✓ Grammatically correct
News & Media
Science
Alternative expressions(2)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
1 human-written examples
I was a sub.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
56 human-written examples
A motif m i is maximal in length if there exists no m l, l ≠ i with and m i is a sub-motif of m l.
Television news Sir David Nicholas, former chief executive of ITN ITN started in 1955 - I was a sub-editor on The Daily Telegraph and Observer then, and I remember handling some big stories and thinking, my God, television was a much more effective way of telling these stories.
News & Media
A colleague remembers: "I was a sub-editor.
News & Media
That was a year and a half ago and now I'm a sub-editor at the same site.
News & Media
I remember Don's story about the break-up because I was a news sub on The Sun at the time.
News & Media
I was wrong in the video when I said there was a sub in each ear cup, and John was wrong when he said these are awful headphones, so there are our admissions.
News & Media
The spectrum of each sub-band i is a sinc-shape and centered at the sub-carrier frequency f i. SAR OFDM signal has been studied for a decade [8, 14].
As a(i) is a measure of how dissimilar i is to its own sub-network, a small value means it is well matched.
Science
I was a goth when I was 13, a sub-species not given to athletic endeavour.
News & Media
I'm not going to be happy being on the bench, but I want to support my teammates because I want to be a respectful player... I'm tired of hearing I'm a good sub.
News & Media
Expert writing Tips
Best practice
When using "I was a sub", ensure the context is clear. If referring to a substitute teacher or temporary worker, specify the field or position to avoid ambiguity.
Common error
Be cautious when using "I was a sub" without context, as "sub" can have multiple meanings, including those related to submissive roles in certain communities. Clarity is key to avoid misinterpretation.
Source & Trust
83%
Authority and reliability
4.3/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "I was a sub" functions as a statement of past status or role. Based on the Ludwig AI summary, the phrase is considered correct and usable, indicating the speaker held a temporary or substitute position. Examples show its usage in contexts ranging from sports to professional roles.
Frequent in
News & Media
65%
Science
25%
Wiki
10%
Less common in
Formal & Business
0%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
The phrase "I was a sub" is a grammatically correct and usable expression that indicates the speaker held a temporary or substitute role, according to Ludwig. While its meaning is generally clear, the context is crucial to avoid ambiguity, as "sub" can have multiple interpretations. In formal settings, more explicit language is recommended. As highlighted by Ludwig AI, this phrase is common in news and media, science, and wiki sources, emphasizing its broad applicability but need for contextual clarity.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
I worked as a substitute
Replaces "sub" with the more explicit "substitute", clarifying the role.
I filled in as a temporary
Uses "filled in" and "temporary" to emphasize the short-term nature of the role.
I was a replacement
Highlights the act of replacing someone, removing ambiguity.
I was a stand-in
Emphasizes the act of standing in for someone, typically in a temporary capacity.
I served as an understudy
Implies a role where one is prepared to take over for someone else, often in performing arts.
I was the alternate
Indicates a secondary role where one is available if the primary person is unavailable.
I acted as a relief
Uses "relief" to convey providing assistance or temporary cover.
I was on the bench
Specifically refers to being a substitute player in sports.
I was a second-stringer
Highlights a backup role, especially in sports or other competitive settings.
I was a reserve
Emphasizes being kept in reserve for when needed.
FAQs
What does "I was a sub" mean?
The phrase "I was a sub" typically means that the speaker acted as a substitute, such as a substitute teacher or a temporary worker. However, "sub" can have other meanings depending on the context, such as a submissive role in certain communities.
What can I say instead of "I was a sub" to be more specific?
You can use alternatives like "I worked as a substitute", "I filled in as a temporary", or "I was a replacement" depending on the context.
Is "I was a sub" formal or informal?
The phrase "I was a sub" is generally considered informal. In formal settings, it is better to use more explicit language such as "I worked as a substitute teacher" or "I served as a temporary replacement".
How can I avoid ambiguity when using "I was a sub"?
To avoid ambiguity, provide clear context. For example, "I was a sub teacher at the local elementary school" or "I was a sub in the team while the regular player was injured".
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
83%
Authority and reliability
4.3/5
Expert rating
Real-world application tested