By vs. Until – English Grammar Exercises for B2
The Last-Minute Task – A strict manager requires an employee to stay overtime to finalize a crucial financial report before the workday officially ends.
Choose the most appropriate word or phrase to complete each sentence. Pay close attention to whether the verb describes a continuous action (like staying or working) or an action that must be completed at a specific deadline (like submitting or finishing).
1 I know it is already 5:00 PM, but you need to stay at your desk ______ 7:00 PM to help me with this financial report.
(a) by
(b) until
(c) to
(d) by the time
2 I don’t care how you do it, but I need the final draft of this document on my desk ______ 6:30 PM.
(a) until
(b) in
(c) by
(d) on
3 Please do not pack up your things and leave the office ______ the data analysis is fully verified by the QA team.
(a) by
(b) by the time
(c) until
(d) since
4 Can you guarantee that the presentation will be successfully emailed to the client ______ tomorrow morning?
(a) by
(b) until
(c) at
(d) to
5 We have to keep calculating these expenditure figures ______ we find where the missing $5,000 went.
(a) by
(b) to
(c) until
(d) by the time
6 The board of directors expects to receive the quarterly summary ______ the end of the day today.
(a) until
(b) by
(c) at
(d) in
7 I will be in a confidential meeting with the CEO, so please hold all my calls ______ 5:15 PM.
(a) by
(b) until
(c) to
(d) by the time
8 ______ the time I get back from the conference room, I want this Excel spreadsheet completely finalized.
(a) Until
(b) On
(c) In
(d) By
9 You must have the entire budget forecast completed ______ the time the regional director arrives at our branch.
(a) until
(b) by
(c) at
(d) to
10 I will ask security to keep the building’s main doors unlocked ______ you finish printing all the physical contracts.
(a) by
(b) to
(c) until
(d) for
11 Let’s order some pizza and work continuously on this portfolio ______ dinner time.
(a) by
(b) until
(c) at
(d) during
12 Ensure that you hit ‘send’ on that critical email ______ 6:00 PM; otherwise, it will be ignored until Monday.
(a) by
(b) until
(c) on
(d) at the time
13 I am absolutely not signing off on this project ______ I see the revised expenditure numbers with my own eyes.
(a) by
(b) by the time
(c) until
(d) when
14 The company’s accounting software will be down for maintenance tonight, so you must process the invoices ______ 8:00 PM.
(a) until
(b) by
(c) to
(d) during
15 Please remain logged into the secure server ______ the IT department confirms that the data backup is successful.
(a) by
(b) until
(c) by the time
(d) since
16 If you don’t submit the tax documents ______ midnight, the corporation will face severe financial penalties.
(a) until
(b) on
(c) by
(d) in
17 I expected you to have this last-minute task wrapped up ______ now! What is causing the delay?
(a) by
(b) until
(c) to
(d) at
18 The whole team has to stay late tonight to fix these bugs, but hopefully, we won’t be here ______ midnight.
(a) by
(b) to
(c) at
(d) until
19 I need you to commit that the sales figures will be double-checked and corrected ______ Friday afternoon.
(a) until
(b) by
(c) inside
(d) to
20 It wasn’t ______ the manager threatened to cut our annual bonuses that everyone started taking the deadline seriously.
(a) by
(b) when
(c) until
(d) to
ANSWER KEY & EXPLANATIONS
1 (b) until
- Why it is correct: “Stay at your desk” is a continuous action. The employee must maintain this state continuously up to the 7:00 PM mark.
- Distractor Analysis: (a) “by” is a common mistake (used for a completion deadline, not for maintaining a continuous state). (c) “to” is a structural error (used for “from X to Y” or direction). (d) “by the time” must be followed by a clause, not a specific hour.
2 (c) by
- Why it is correct: Having the draft on the desk is a completed action/state that acts as a deadline. It must be there no later than 6:30 PM.
- Distractor Analysis: (a) “until” is a common mistake (you cannot “need it on the desk continuously until 6:30 and then remove it”; it means it must arrive before that time). (b) “in”, (d) “on” are incorrect prepositions for this time context.
3 (c) until
- Why it is correct: The negative state of “not leaving” (staying) will continue uninterrupted up to the moment the data is verified.
- Distractor Analysis: (a) “by” is a common mistake. (b) “by the time” is a strong distractor. (d) “since” is a structural error.
4 (a) by
- Why it is correct: “Emailed” is an instantaneous, completed action. Tomorrow morning serves as the absolute deadline for this completion.
- Distractor Analysis: (b) “until” is a common mistake (you cannot continuously send an email). (c) “at”, (d) “to” are grammatical errors in this context.
5 (c) until
- Why it is correct: “Keep calculating” describes an ongoing, continuous action that will only cease when the missing money is found.
- Distractor Analysis: (a) “by” is a common mistake. (d) “by the time” is a strong distractor. (b) “to” is a structural error.
6 (b) by
- Why it is correct: Receiving the summary is a completed action. “The end of the day” is the deadline.
- Distractor Analysis: (a) “until” is a common mistake. (c) “at”, (d) “in” lack the “no later than” nuance required for a deadline.
7 (b) until
- Why it is correct: “Hold my calls” is a continuous instruction. The secretary must continuously perform this action up to 5:15 PM.
- Distractor Analysis: (a) “by” is a common mistake. (d) “by the time” is a strong distractor. (c) “to” is a structural error.
8 (d) By
- Why it is correct: Combined with “the time”, it creates the conjunction phrase “By the time” (meaning “no later than the moment”). The spreadsheet must be finalized before the manager returns.
- Distractor Analysis: (a) “Until” is a common mistake. (b) “On”, (c) “In” do not form the correct grammatical phrase here.
9 (b) by
- Why it is correct: Similar to question 8, it pairs with “the time” to indicate a deadline before a secondary event (the director arriving).
- Distractor Analysis: (a) “until” is a common mistake. (c) “at”, (d) “to” are structural errors.
10 (c) until
- Why it is correct: “Keep the doors unlocked” is a continuous state that lasts up to the point the printing is finished.
- Distractor Analysis: (a) “by” is a common mistake. (b) “to”, (d) “for” are structural errors.
11 (b) until
- Why it is correct: “Work continuously” explicitly dictates an ongoing action lasting up to dinner time.
- Distractor Analysis: (a) “by” is a common mistake. (c) “at” is a strong distractor. (d) “during” must be followed by a noun representing a duration, not a specific point.
12 (a) by
- Why it is correct: “Hit send” is an instantaneous action that must be completed before or exactly at the deadline of 6:00 PM.
- Distractor Analysis: (b) “until” is a common mistake. (d) “at the time” alters the necessary meaning. (c) “on” is a structural error.
13 (c) until
- Why it is correct: The manager’s refusal (“not signing off”) is a continuous state that will be maintained right up to the moment they see the revised numbers.
- Distractor Analysis: (a) “by” is a common mistake. (b) “by the time” is a strong distractor. (d) “when” alters the tone from a condition to a simple time marker.
14 (b) by
- Why it is correct: “Process the invoices” is a task that must be completed. 8:00 PM is the strict deadline before the system goes offline.
- Distractor Analysis: (a) “until” is a common mistake (if you process them until 8:00, you might not finish; by 8:00 ensures completion). (c) “to”, (d) “during” are structural errors.
15 (b) until
- Why it is correct: “Remain logged in” is a continuous action extending up to the IT department’s confirmation.
- Distractor Analysis: (a) “by” is a common mistake. (c) “by the time” is a strong distractor. (d) “since” is a grammatical error.
16 (c) by
- Why it is correct: “Submit” is a completed action requiring a deadline. Midnight is the absolute limit.
- Distractor Analysis: (a) “until” is a common mistake. (b) “on”, (d) “in” are incorrect prepositions for “midnight”.
17 (a) by
- Why it is correct: “By now” is a fixed idiomatic phrase meaning “no later than the current moment” or “already”.
- Distractor Analysis: (b) “until” is a common mistake. (d) “at”, (c) “to” do not form the correct idiom.
18 (d) until
- Why it is correct: “Be here” (staying at the office) is a continuous state. The speaker hopes this state does not stretch all the way to midnight.
- Distractor Analysis: (a) “by” is a common mistake. (b) “to”, (c) “at” are grammatical errors in this context.
19 (b) by
- Why it is correct: The figures being “double-checked and corrected” signifies a completed task with a deadline set for Friday afternoon.
- Distractor Analysis: (a) “until” is a common mistake. (c) “inside”, (d) “to” are structural errors.
20 (c) until
- Why it is correct: Uses the emphatic structure “It wasn’t until… that…” (meaning: not before a certain event happened).
- Distractor Analysis: (a) “by” is a common mistake. (b) “when” is a strong distractor but breaks the specific grammar structure. (d) “to” is a structural error.
GRAMMAR POINTS TO REMEMBER
To master the difference between By and Until in a fast-paced business environment, you must determine the nature of the task: “Is the manager asking me to DO SOMETHING CONTINUOUSLY, or to HAVE SOMETHING FINISHED?”
1 UNTIL (Up to a point in time)
- Core Function: Used for actions or states that are CONTINUOUS. You maintain the action, and then you stop when the time arrives.
- Common Business Verbs: stay, wait, keep working, remain, hold calls, or negative states (not leave, not sign off).
- Example: You must stay at the office until 8 PM. (The action of staying is continuous).
2 BY (No later than a point in time)
- Core Function: Used to establish a strict DEADLINE. The action does not stretch over time; it is a completed event that must be finished before or at the stated time.
- Common Business Verbs: submit, finish, send, email, complete, receive.
- Example: You must submit the report by 8 PM. (The action of submitting happens in an instant; it must be done before the clock hits 8 PM).
3 BY THE TIME (Conjunction phrase)
- Structure: By the time + Subject + Verb
- Core Function: Means “No later than the moment that…”. It sets a deadline based on an event rather than a specific clock time.
- Example: Please have the files ready by the time the boss arrives.