5 exercises — practise standard and inverted "not until" structures.
0 / 5 completed
1 / 5
Which sentence correctly uses "not until" in standard word order to describe a delayed discovery?
"The team did not notice the leak until the memory usage graph flattened out at the limit" correctly places "not" with the auxiliary "did" and uses "until" alone to introduce the delayed trigger point. Option B doubles the negator by adding an extra "not" before "until". Option C misorders "not" before "did". Option D misplaces "not" after the main verb instead of attaching it to the auxiliary.
2 / 5
Which sentence correctly uses fronted "not until" with subject-auxiliary inversion for emphasis in a postmortem?
"Not until the third retry did the request finally succeed" correctly fronts "not until" and inverts the subject and auxiliary ("did the request") as required after a negative adverbial at the start of a sentence. Option B keeps the subject before the auxiliary, failing to invert. Option C omits inversion entirely, which is required once "not until" opens the sentence. Option D scrambles the word order of the fronted phrase itself.
3 / 5
Which sentence correctly uses fronted "not until" with a perfect auxiliary to emphasize a very late fix?
"Not until version 4.2 had the root cause been properly addressed" correctly inverts the auxiliary "had" before the subject "the root cause" after the fronted negative adverbial. Option B keeps standard subject-auxiliary order, which is incorrect after fronting. Options C and D scramble the auxiliary, subject, and past participle into non-standard positions.
4 / 5
Which sentence correctly uses "not until" without inversion, in the standard main-clause position, describing a deployment gate?
"The release does not go out until every integration test has passed" is correct: with standard subject-first word order, "not" attaches to the auxiliary "does" and "until" alone introduces the condition; no inversion is needed because the sentence does not open with the negative adverbial. Option B misorders "not" and "does". Option C misplaces "not" before the subject. Option D incorrectly repeats "not" before "until".
5 / 5
Which sentence correctly uses fronted "not until" with a modal auxiliary to emphasize when a feature will become available?
"Not until the next quarter will the multi-region failover feature be generally available" correctly inverts the modal "will" before the subject after the fronted negative time phrase. Option B fails to invert, keeping the subject before "will". Option C moves "be" before the subject instead of "will", which is the wrong auxiliary to invert. Option D moves "will" to the wrong position entirely, before "the next quarter".