By vs. Until – English Grammar Exercises for B2
The Overnight Road Trip – Narrating an exhausting, persistent overnight drive to reach a mountain campsite before dawn.
Choose the most appropriate word or phrase to complete each sentence. Pay close attention to whether the verb describes a continuous action (like driving or waiting) or an action that must be completed at a specific deadline (like arriving or reaching).
1 We drove continuously without taking a single break ______ 3:00 AM, relying entirely on energy drinks.
(a) by
(b) until
(c) by the time
(d) to
2 We absolutely had to reach the mountain campsite ______ dawn to secure a good spot near the lake.
(a) until
(b) to
(c) by
(d) for
3 I managed to keep my eyes glued to the dark road ______ my co-driver finally woke up to take the wheel.
(a) by
(b) during
(c) by the time
(d) until
4 ______ we actually arrived at the forest entrance, we were completely exhausted and sleep-deprived.
(a) Until
(b) By the time
(c) By
(d) At the time
5 The heavy thunderstorm didn’t stop pouring ______ we crossed the state border into Nevada.
(a) by
(b) to
(c) until
(d) since
6 I promised the rest of the group that we would have the tents fully set up ______ 6:00 AM.
(a) until
(b) in
(c) by
(d) on
7 My best friend kept chatting about random things ______ he eventually dozed off in the passenger seat.
(a) by
(b) until
(c) by the time
(d) to
8 The gas indicator was flashing, so we had to find a service station ______ 4:00 AM, or we would be stranded in the dark.
(a) until
(b) at
(c) by
(d) to
9 I didn’t let anyone else take over the driving ______ I felt my reflexes dangerously slowing down.
(a) by
(b) during
(c) by the time
(d) until
10 We wanted to have the campfire already burning brightly ______ the others woke up in the back of the van.
(a) until
(b) to
(c) by the time
(d) by
11 Keep following this winding dirt road ______ you see a wooden sign for the national park.
(a) by
(b) until
(c) by the time
(d) to
12 We calculated that we would have covered over 400 miles ______ sunrise.
(a) until
(b) in
(c) to
(d) by
13 The engine overheated, forcing us to wait on the shoulder of the highway ______ the radiator cooled down.
(a) until
(b) by
(c) by the time
(d) during
14 We needed to have the engine checked and be back on the road ______ 8:00 AM to beat the morning traffic.
(a) until
(b) to
(c) by
(d) at
15 Let’s just keep pushing forward ______ we find a safe, well-lit rest stop to pull over.
(a) by
(b) until
(c) by the time
(d) for
16 I blasted loud rock music through the speakers ______ my ears literally started ringing, just to stay awake.
(a) by
(b) during
(c) to
(d) until
17 ______ the time the sun finally peaked over the horizon, we had successfully reached the summit.
(a) Until
(b) By
(c) In
(d) At
18 ______ this grueling road trip, I had never driven for ten hours straight through the night.
(a) By
(b) Until
(c) To
(d) During
19 You need to pack all your hiking gear in the trunk ______ midnight so we can leave immediately.
(a) until
(b) for
(c) by
(d) to
20 The fog was so thick that we couldn’t see the mountain peaks ______ the morning breeze cleared the air.
(a) by
(b) by the time
(c) until
(d) to
ANSWER KEY & EXPLANATIONS
1 (b) until
- Why it is correct: “Drove” is a continuous action. It lasted continuously up to the specific point of 3:00 AM and then stopped.
- Distractor Analysis: (a) “by” is a common mistake (used for deadlines of completed actions, not continuous ones). (c) “by the time” is a strong distractor (must be followed by a clause, not a specific time). (d) “to” is a structural error.
2 (c) by
- Why it is correct: “Reach” is an instantaneous, completed action. “By dawn” establishes a strict deadline (no later than dawn).
- Distractor Analysis: (a) “until” is a common mistake (you cannot continuously “reach” a place). (b) “to” is a structural error. (d) “for” is a meaning trap.
3 (d) until
- Why it is correct: Keeping one’s eyes glued to the road is a continuous state that was maintained right up to the moment the co-driver woke up.
- Distractor Analysis: (a) “by” is a common mistake. (c) “by the time” is a strong distractor (used for deadlines, not continuous durations). (b) “during” is a structural error (must be followed by a noun, not a clause).
4 (b) By the time
- Why it is correct: This is a conjunction phrase setting a deadline before another event. It means “No later than the moment we arrived.”
- Distractor Analysis: (a) “Until” is a common mistake. (c) “By” is a structural error (“by” cannot be directly followed by a subject + verb without “the time”). (d) “At the time” is a meaning trap.
5 (c) until
- Why it is correct: The negative state (“didn’t stop”) was continuous up to the point of crossing the border.
- Distractor Analysis: (a) “by” is a common mistake. (b) “to” is a structural error. (d) “since” is a meaning trap.
6 (c) by
- Why it is correct: Setting up the tents is an action that must be completed before or exactly at the deadline of 6:00 AM.
- Distractor Analysis: (a) “until” is a common mistake. (b) “in” is a strong distractor. (d) “on” is a structural error.
7 (b) until
- Why it is correct: “Kept chatting” is a continuous action that lasted up to the moment the friend dozed off.
- Distractor Analysis: (a) “by” is a common mistake. (c) “by the time” is a strong distractor. (d) “to” is a structural error.
8 (c) by
- Why it is correct: Finding a service station is a completed action that requires a strict deadline (before 4:00 AM) to avoid being stranded.
- Distractor Analysis: (a) “until” is a common mistake. (b) “at” is a strong distractor (‘at’ implies exactly 4:00 AM, but ‘by’ fits the urgency of a deadline much better). (d) “to” is a structural error.
9 (d) until
- Why it is correct: The continuous state of “not letting anyone take over” lasted right up to the point the reflexes slowed down.
- Distractor Analysis: (a) “by” is a common mistake. (c) “by the time” is a strong distractor. (b) “during” is a structural error.
10 (c) by the time
- Why it is correct: Setting a deadline (having the fire burning) before a secondary event (the others waking up). Requires the conjunction phrase “by the time + Subject + Verb”.
- Distractor Analysis: (a) “until” is a common mistake. (d) “by” is a structural error (“by” cannot be followed directly by a clause without “the time”). (b) “to” is a structural error.
11 (b) until
- Why it is correct: “Keep following” is a continuous action that you maintain up to the visual cue of the wooden sign.
- Distractor Analysis: (a) “by” is a common mistake. (c) “by the time” is a strong distractor. (d) “to” is a structural error.
12 (d) by
- Why it is correct: “Would have covered” is a future-in-the-past perfect tense, indicating completion before a deadline. The deadline is “sunrise”.
- Distractor Analysis: (a) “until” is a common mistake. (b) “in” is a strong distractor. (c) “to” is a structural error.
13 (a) until
- Why it is correct: To “wait” is a continuous duration action that ends when the radiator cools down.
- Distractor Analysis: (b) “by” is a common mistake. (c) “by the time” is a strong distractor. (d) “during” is a structural error.
14 (c) by
- Why it is correct: Being “back on the road” requires a deadline to beat the traffic. It must be completed no later than 8:00 AM.
- Distractor Analysis: (a) “until” is a common mistake. (d) “at” is a strong distractor. (b) “to” is a structural error.
15 (b) until
- Why it is correct: “Keep pushing forward” is a continuous action that stops once a safe spot is found.
- Distractor Analysis: (a) “by” is a common mistake. (c) “by the time” is a strong distractor. (d) “for” is a structural error.
16 (d) until
- Why it is correct: Blasting the music is a continuous action that lasted up to the physical result (ears ringing).
- Distractor Analysis: (a) “by” is a common mistake. (b) “during” is a structural error. (c) “to” is a structural error.
17 (b) By
- Why it is correct: Paired with “the time”, it forms “By the time” (No later than). The action of reaching the summit was completed before this moment.
- Distractor Analysis: (a) “Until” is a common mistake. (c) “In” is a structural error. (d) “At” is a strong distractor.
18 (b) Until
- Why it is correct: “Until this trip” means up to the point of this specific trip. The state of “never having driven ten hours straight” was continuous up to this event.
- Distractor Analysis: (a) “By” is a common mistake. (c) “To” is a structural error. (d) “During” is a meaning trap.
19 (c) by
- Why it is correct: Packing the gear is an action that must be completed before the deadline of midnight.
- Distractor Analysis: (a) “until” is a common mistake (you don’t want them continuously packing until midnight; you want it finished before midnight). (b) “for” is a structural error. (d) “to” is a structural error.
20 (c) until
- Why it is correct: The negative state of “couldn’t see” was continuous and only ended when the morning breeze cleared the air.
- Distractor Analysis: (a) “by” is a common mistake. (b) “by the time” is a strong distractor. (d) “to” is a structural error.
GRAMMAR POINTS TO REMEMBER
To master the difference between By and Until, especially in the context of travel and time management, ask yourself: “Am I describing a continuous, ongoing effort, or a strict deadline for completion?”
1 UNTIL (Up to a certain time)
- Core Concept: Used for an action or state that is CONTINUOUS and will stop when a certain time or event occurs.
- Road Trip Verbs: wait, drive, sleep, stay awake, keep moving, or continuous negative states (didn’t stop, couldn’t see).
- Example: I will drive until 3 AM. (The driving is continuous and stops exactly at 3 AM).
2 BY (No later than / Before)
- Core Concept: Used to establish a DEADLINE. The action is not continuous; it is a completed event that must happen before or at that specific time.
- Road Trip Verbs: arrive, reach, finish, set up, pack, leave.
- Example: We must arrive by 3 AM. (The driving might happen earlier, but the completed action of ‘arriving’ must be done no later than 3 AM).
3 BY THE TIME (Conjunction)
- Structure: By the time + Subject + Verb
- Core Concept: Used when setting a deadline based on an action or event rather than a specific hour. It is often followed by a perfect tense in the main clause.
- Example: By the time we arrived, the sun had already risen.