Defining vs Non-Defining Relative Clauses in Technical English
5 exercises — master the comma-based distinction that changes meaning in specifications, incident reports, and technical documentation.
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1 / 5
Choose the sentence that uses a DEFINING relative clause correctly.
A defining (restrictive) relative clause identifies WHICH item we mean — it is essential to the meaning. It takes no commas. "The microservice that handles payments" tells us specifically which microservice. Option A incorrectly adds commas around a defining clause, which would make it non-defining (implying there is only one microservice). In technical documentation, removing or adding commas around a relative clause changes the meaning entirely.
2 / 5
Which sentence uses a NON-DEFINING relative clause correctly?
A non-defining (non-restrictive) relative clause adds supplementary information about a noun that is already fully identified. It is enclosed in commas and always uses "which" (not "that") for things. Option A is missing commas. Option C incorrectly uses "that" in a non-defining clause — "that" is only used in defining clauses. Option D has incorrect comma placement that breaks the sentence structure.
3 / 5
The team ___ owns the CI pipeline is responsible for the outage. Choose the correct relative pronoun.
"That" is the standard choice when the relative clause is defining and the antecedent is a group or collective noun (not a person individually). "Which" is used for things in non-defining clauses or informally in defining clauses for non-human referents. "Whom" refers to a person as the object of a verb or preposition. "Whose" indicates possession. Here "the team that owns the CI pipeline" correctly uses "that" in a defining clause.
4 / 5
Identify the pair where the use of commas changes the meaning.
This is the key distinction: "The servers that run in Frankfurt are faster" implies some servers run elsewhere and are not as fast — the clause defines WHICH servers. "The servers, which run in Frankfurt, are faster" implies ALL servers run in Frankfurt and all are faster — the clause merely adds information. The comma transforms the meaning. Options B, C, and D are incorrect: commas always have the potential to change meaning in relative clauses, never making them truly optional.
5 / 5
Our lead architect, ___ designed the event-driven system, will present the migration plan.
When the antecedent is a person, use "who" (not "that" or "which") in relative clauses. This is a non-defining clause (note the commas) because "our lead architect" already fully identifies the person. "Whom" would be used if the person is the object of the clause (e.g., "the architect whom we hired"), not the subject. "That" and "which" are used for things, not people. Using "who" here is both grammatically and stylistically correct for professional technical writing.