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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
had signed up for
Grammar usage guide and real-world examplesUSAGE SUMMARY
"had signed up for" is a correct and usable phrase in written English.
It is used to indicate that someone has agreed to do something or they have committed or promised to do it in the past. For example: John had signed up for the marathon, but he didn't make it on race day due to an injury.
✓ Grammatically correct
News & Media
Academia
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
58 human-written examples
About 400 people had signed up for the cruise.
News & Media
He said neither had signed up for the group.
News & Media
Some had signed up for a body fat screening.
News & Media
I had signed up for two long day trips.
News & Media
That evening, Ann was attending a cooking class that she had signed up for with Harroun.
News & Media
Meg Wolitzer, the novelist, had signed up for the three-day event….
News & Media
Mr. Kanojia declined to disclose how many people had signed up for Aereo so far.
News & Media
We knew what we had signed up for, but it was still tough.
News & Media
As of March 1st 4.2m Americans had signed up for coverage through Obamacare's insurance exchanges.
News & Media
I stuck to my guns – pointing out that they had signed up for the class knowing this was the deal.
Mr. Nocas said that about 10 million people had signed up for the Xbox Live service.
News & Media
Expert writing Tips
Best practice
Use "had signed up for" when emphasizing a past action of registering or enrolling in something. It's particularly useful when describing a completed action with ongoing relevance or consequences.
Common error
Avoid using present or future tenses when describing an action that was completed in the past. For example, don't say "He is signing up for the class last week"; instead, use "He "had signed up for" the class last week".
Source & Trust
89%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "had signed up for" functions as a past perfect verb phrase, indicating that an action of registering or enrolling occurred before another point in the past. As seen in Ludwig's examples, this construction is commonly used to provide background information or establish a sequence of events.
Frequent in
News & Media
84%
Academia
7%
Science
3%
Less common in
Formal & Business
3%
Wiki
1%
Reference
1%
Ludwig's WRAP-UP
In summary, "had signed up for" is a very common and grammatically correct past perfect verb phrase used to indicate that someone completed the action of registering or enrolling in something before a specific point in the past. Ludwig AI confirms its validity and widespread use across various contexts, particularly in news and media. When using this phrase, ensure the tense is consistent with the intended meaning and consider alternatives like "had registered for" or "had enrolled in" depending on the context. Remember that incorrect tense usage is a common error to avoid.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
had registered for
Replaces "signed up" with "registered", implying a more formal enrollment process.
had enrolled in
Uses "enrolled" instead of "signed up", suggesting a more academic or structured commitment.
had subscribed to
Employs "subscribed" indicating a recurring commitment, often for services or content.
had enlisted for
Replaces "signed up" with "enlisted", implying a commitment to a cause or organization.
had committed to
Uses "committed" indicating a promise or dedication to something.
had agreed to participate in
More verbose, emphasizing agreement and involvement in an activity.
had joined
A simpler alternative, focusing on becoming a member of a group or organization.
had put their name down for
An idiomatic alternative, suggesting a preliminary expression of interest.
had made arrangements for
Focuses on the preparatory steps taken to secure a place or service.
had secured a spot in
Highlights the successful acquisition of a limited opportunity.
FAQs
What does ""had signed up for"" mean?
The phrase ""had signed up for"" indicates that someone had previously registered or enrolled in something before a specific point in time. It implies a completed action of registration or enrollment.
How can I use ""had signed up for"" in a sentence?
You can use it to describe a past action of registering. For example, "She "had signed up for" the course before the deadline" or "They "had signed up for" the membership last year."
Which is correct: ""had signed up for"" or "signed up for"?
Both are correct, but they convey different meanings. "Signed up for" indicates a past action, while ""had signed up for"" indicates an action completed before another point in time. The choice depends on the context.
What are some alternatives to ""had signed up for""?
Alternatives include "had registered for", "had enrolled in", or "had subscribed to", depending on the specific context.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
89%
Authority and reliability
4.6/5
Expert rating
Real-world application tested