By vs. Until – English Grammar Exercises for B2
Read the department head’s opening remarks regarding the meeting schedule carefully. Choose the best option to complete the sentences.
1 “Good morning, everyone. We have a lot to cover, so we will brainstorm potential campaign ideas ______ exactly 10:30 AM.”
(a) by
(b) until
(c) within
(d) at
2 “However, to avoid talking in circles, we absolutely must reach a final consensus on the core theme ______ 10:45 AM.”
(a) until
(b) for
(c) by
(d) during
3 “Please hold all your specific budget questions ______ the finance director finishes her quarterly presentation.”
(a) until
(b) by
(c) to
(d) in
4 “I expect every team leader to officially submit their resource requests ______ the end of the day.”
(a) until
(b) during
(c) at
(d) by
5 “The floor will remain open for healthy debate and alternative suggestions ______ noon.”
(a) by
(b) within
(c) until
(d) since
6 “We cannot leave this room today unless we finalize the Q3 product roadmap ______ 3:00 PM.”
(a) until
(b) to
(c) by
(d) as
7 “We are going to deeply analyze the recent competitor data ______ the coffee break begins.”
(a) by
(b) until
(c) in
(d) by the time
8 “We need to come to a firm agreement regarding the new pricing strategy ______ the client arrives at 2 PM.”
(a) until
(b) by
(c) for
(d) at
9 “I want us to deliberately discuss these operational risks ______ we fully understand the potential consequences.”
(a) until
(b) by
(c) by the time
(d) within
10 “To keep us on schedule, we must vote on the new vendor contracts ______ the meeting concludes.”
(a) until
(b) during
(c) in
(d) by
11 “You can continue tweaking your individual presentation slides ______ Thursday afternoon.”
(a) by
(b) until
(c) at
(d) within
12 “However, the final slide deck must be completely merged and polished ______ Friday morning.”
(a) until
(b) in
(c) by
(d) to
13 “We will deliberate on the structural changes ______ 2:00 PM, meaning we must establish a clear action plan ______ 2:30 PM.”
(a) by / until
(b) until / by
(c) by / by
(d) until / until
14 “Please do not lock in any project dates ______ the HR team officially confirms the availability of the staff.”
(a) by
(b) within
(c) until
(d) at
15 “We have to narrow down our massive list of job candidates to just three people ______ 4:00 PM today.”
(a) until
(b) during
(c) by
(d) since
16 “Let’s keep the discussion focused purely on software development ______ the lunch break.”
(a) by
(b) until
(c) to
(d) in
17 “Every manager in this room must sign off on this finalized budget ______ the end of this strategy session.”
(a) until
(b) by
(c) for
(d) at
18 “We will postpone making the ultimate decision ______ all regional directors have shared their input.”
(a) by
(b) until
(c) by the time
(d) as
19 “I need everyone to wrap up their departmental updates ______ 9:30 AM so we can move to the main agenda.”
(a) until
(b) during
(c) by
(d) to
20 “We will keep exploring these creative concepts ______ 11 AM, but we absolutely must select one winning idea ______ noon.”
(a) by / until
(b) until / until
(c) until / by
(d) by / by
ANSWER KEY & EXPLANATIONS
1 (b) until
- Why it is correct (The Key): “Brainstorm” is a continuous activity. Until is used to show how long an ongoing action continues before it stops.
- Error Analysis: (a) by (Common Mistake: You cannot continuously brainstorm by a time; by is for single, completed actions). (c) within (Structural Error: Requires a duration, like “within an hour”). (d) at (Meaning Trap: “At” means starting the brainstorm at exactly 10:30, reversing the logic of the agenda).
2 (c) by
- Why it is correct (The Key): “Reach a consensus” is a punctual, completed action. It serves as a strict deadline, meaning the decision must be made at or before 10:45 AM.
- Error Analysis: (a) until (Common Mistake: You cannot continuously “reach” a consensus over a period of time). (b) for (Structural Error). (d) during (Meaning Trap: Lacks the deadline enforcement required by the manager).
3 (a) until
- Why it is correct (The Key): “Hold questions” implies maintaining a state of waiting. This state continues up to the point the presentation ends.
- Error Analysis: (b) by (Common Mistake: “Hold” is continuous, not a momentary completion). (c) to (Structural Error). (d) in (Structural Error).
4 (d) by
- Why it is correct (The Key): “Submit” is a momentary action. The manager sets a deadline for this completed action to happen.
- Error Analysis: (a) until (Common Mistake). (b) during (Meaning Trap: Too vague, removing the sense of a deadline). (c) at (Meaning Trap: “At the end of the day” is possible, but “by” is the superior choice to establish a “no later than” deadline).
5 (c) until
- Why it is correct (The Key): “Remain open” is an ongoing state. Until marks the end of that continuous period.
- Error Analysis: (a) by (Common Mistake). (b) within (Structural Error). (d) since (Structural Error: Refers to the starting point in the past, not the end point in the future).
6 (c) by
- Why it is correct (The Key): “Finalize” is a verb of completion. The action of making it final must happen no later than 3:00 PM.
- Error Analysis: (a) until (Common Mistake: You cannot continuously finalize something for hours). (b) to (Structural Error). (d) as (Structural Error).
7 (b) until
- Why it is correct (The Key): “Analyze” (especially deeply) is an ongoing process here. The analysis will continue up to the time the break begins.
- Error Analysis: (a) by (Common Mistake). (c) in (Structural Error). (d) by the time (Meaning Trap: While grammatically possible to say “We will have analyzed it by the time…”, the verb here is continuous “are going to analyze”, requiring until).
8 (b) by
- Why it is correct (The Key): “Come to an agreement” is a punctual achievement. It must be completed before the client walks in.
- Error Analysis: (a) until (Common Mistake: You cannot continuously “come to” an agreement). (c) for (Structural Error). (d) at (Meaning Trap: Means doing it at the exact second the client walks in, which is too late).
9 (a) until
- Why it is correct (The Key): “Discuss” is a continuous activity. The debate lasts up to the point of full understanding.
- Error Analysis: (b) by (Common Mistake: “Discuss by” is grammatically incorrect for describing the duration of a debate). (c) by the time (Structural Error). (d) within (Structural Error).
10 (d) by
- Why it is correct (The Key): “Vote” acts as a conclusive, momentary action here. It serves as a deadline before the meeting ends.
- Error Analysis: (a) until (Common Mistake). (b) during (Meaning Trap: Lacks the strict “before this happens” deadline nuance). (c) in (Structural Error).
11 (b) until
- Why it is correct (The Key): “Continue tweaking” is explicitly an ongoing action.
- Error Analysis: (a) by (Common Mistake). (c) at (Meaning Trap). (d) within (Structural Error).
12 (c) by
- Why it is correct (The Key): “Be merged and polished” is the final, completed state. Friday morning is the deadline.
- Error Analysis: (a) until (Common Mistake). (b) in (Structural Error). (d) to (Structural Error).
13 (b) until / by
- Why it is correct (The Key): “Deliberate” (debate) is a continuous process (until 2:00 PM). “Establish a plan” is a conclusive achievement representing a deadline (by 2:30 PM).
- Error Analysis: (a) by / until (Meaning Trap: Reverses the logic). (c) by / by (Common Mistake). (d) until / until (Common Mistake).
14 (c) until
- Why it is correct (The Key): When a punctual action is negated (“do not lock in dates”), it creates a continuous state of not doing it. You wait until the condition (HR confirmation) is met.
- Error Analysis: (a) by (Common Mistake). (b) within (Structural Error). (d) at (Structural Error).
15 (c) by
- Why it is correct (The Key): “Narrow down” (to finish reducing the list) is a completed action serving as a deadline.
- Error Analysis: (a) until (Common Mistake). (b) during (Meaning Trap). (d) since (Structural Error).
16 (b) until
- Why it is correct (The Key): “Keep the discussion focused” is an ongoing state maintained up to the lunch break.
- Error Analysis: (a) by (Common Mistake). (c) to (Structural Error). (d) in (Structural Error).
17 (b) by
- Why it is correct (The Key): “Sign off” is a momentary action of approval. It must be completed before the session ends.
- Error Analysis: (a) until (Common Mistake: You cannot continuously sign a document). (c) for (Structural Error). (d) at (Meaning Trap).
18 (b) until
- Why it is correct (The Key): “Postpone” initiates a state of waiting/delaying. You delay the decision until the prerequisite condition is met.
- Error Analysis: (a) by (Common Mistake). (c) by the time (Meaning Trap: Clunky and alters the grammatical requirement of the dependent clause). (d) as (Structural Error).
19 (c) by
- Why it is correct (The Key): “Wrap up” (finish) is a punctual action. 9:30 AM is the strict deadline to complete it.
- Error Analysis: (a) until (Common Mistake: You cannot continuously wrap up over a long period). (b) during (Meaning Trap). (d) to (Structural Error).
20 (c) until / by
- Why it is correct (The Key): “Keep exploring” is a continuous brainstorming process (until 11 AM). “Select one winning idea” is the punctual, final decision representing a deadline (by noon).
- Error Analysis: (a) by / until (Meaning Trap: Reverses the logic completely). (b) until / until (Common Mistake: You cannot continuously select one idea). (d) by / by (Common Mistake: You cannot keep doing something “by” a time).
GRAMMAR POINTS TO REMEMBER
1 UNTIL (For the Process):
- Use Until to define the duration of an ongoing action or state. It answers the question: How long will we keep doing this before we stop?
- Common Meeting Verbs: discuss, debate, deliberate, brainstorm, wait, remain, keep (doing something), hold.
- Example: “We will debate the issue until 3 PM.” (The debate is a continuous process spanning the whole time).
2 BY (For the Deadline):
- Use By to indicate a strict deadline for a completed action. It answers the question: What is the latest possible time this action can be finished? (It means “at or before”).
- Common Meeting Verbs: decide, finalize, vote, reach a consensus, come to an agreement, submit, wrap up, sign.
- Example: “We must decide on the budget by 3 PM.” (The decision is a single moment that must happen before the clock hits 3 PM).
3 The “Do Not” Rule (Negative States):
- When you tell someone not to do a momentary action (e.g., “Do not sign”), it creates a continuous state of waiting. Therefore, you use until.
- Example: “Do not finalize the timeline until the client approves.” (Wait up to the point of approval).