ESL Worksheets English Exercises - Free Printable

Let’s go through each sentence one by one. We need to fill in the blank with at, in, or on — depending on what makes sense for time.

Here’s a quick reminder (just to help you think):
- Use in for months, years, seasons, and parts of the day (like “in January”, “in 2025”, “in summer”, “in the morning”).
- Use on for specific days and dates (like “on Monday”, “on my birthday”, “on July 4th”).
- Use at for exact times and some fixed expressions (like “at 7 o’clock”, “at night”, “at noon”, “at lunchtime”).

Now let’s solve each sentence:

1. My brother’s birthday is ___ → Already done: in January ✔
*(January is a month → use “in”)*

2. My birthday is ___ → Let’s say your birthday is in a month, like “in May”. But since we don’t know, we can pick any correct example. For practice, let’s use in June.
*(You can change this to your actual birth month!)*

3. I was born ___ → Again, usually followed by a year or month. Example: in 2010 or in March. Let’s use in 2010.

4. Our class starts ___ → Classes often start at a time. Example: at 8 AM.

5. What time do you usually get up ___ → This asks for a time. Example: at 7 o’clock.

6. Last night, I went to bed ___ → “Last night” already tells us when, but if we add more, it might be “at midnight” or just leave it? Wait — actually, the sentence is complete as “Last night, I went to bed.” But since there’s a blank, maybe they want something like “at 10 PM”? Or perhaps it’s testing “at night”? Hmm… Actually, looking again — maybe it’s meant to be completed with a time. Let’s put at 10 PM.

Wait — let me double-check #6. The original says: “Last night, I went to bed ___” — that seems odd because “last night” already covers the time. Maybe it’s a trick? Or maybe it’s supposed to be “I went to bed late” — but no, we must use at/in/on. Perhaps it’s “at night”? But “last night” already includes “night”. Maybe it’s a mistake? Let’s assume they want a time — so at 11 PM.

Actually, let’s look at common usage. Sometimes people say “I went to bed at midnight” even after saying “last night”. So yes, at midnight works.

But to keep it simple, let’s use at 10 PM.

7. Steven often gets up late ___ → “Late” what? Late in the morning? Late on weekends? Probably means he gets up late *in the morning*. So: in the morning.

Wait — “gets up late” could also be followed by “on weekends” — but the sentence doesn’t specify. Since it says “often”, maybe it’s general. Best fit: in the morning.

Alternatively, sometimes we say “he gets up late at weekends” — but that’s British English. In American English, it’s “on weekends”. But the instruction is about time prepositions. Let’s stick with in the morning — it’s safe.

8. We eat lunch ___ → Lunch happens at a time of day. We say “at lunchtime” or “at noon”. Let’s use at noon.

9. Where I live, it snows ___ → Snows when? In winter. So: in winter.

10. The meeting is ___ → Meetings are scheduled for specific times or days. Could be “at 3 PM” or “on Monday”. Let’s pick on Monday.

11. Do you like to watch TV ___ → Watch TV when? In the evening? At night? On weekends? Common phrase: in the evening.

12. Do you have to go to school ___ → Go to school on weekdays? In the morning? On Mondays? Most natural: on weekdays or in the morning. Let’s use on weekdays.

Wait — “go to school” is usually during the week. “On weekdays” is good. Alternatively, “in the morning” also works. But “on weekdays” is more precise for schedule.

13. People landed on the moon ___ → Historical event: Apollo 11 landed on July 20, 1969. So we say on July 20, 1969 — but since we’re using at/in/on, and it’s a date, we use on. But the blank is after “moon”, so probably expecting a time expression. Actually, the full phrase is “landed on the moon on July 20, 1969”. So here, the blank should be filled with the date part. But since we don’t have space for full date, maybe just in 1969? No — for specific dates, we use “on”.

Wait — the sentence is: “People landed on the moon ___” — so the blank is for the time. Correct answer: on July 20, 1969 — but that’s long. Maybe they expect in 1969? But technically, for exact date, it’s “on”. However, in many textbooks, they accept “in 1969” for year. To be accurate, let’s use on July 20 — but since it’s not specified, perhaps the expected answer is in 1969.

Looking at standard grammar exercises, for historical events with only year given, they use “in”. Example: “Man first walked on the moon in 1969.” So I’ll go with in 1969.

14. I always get up ___ → Similar to #5. Get up at a time. Example: at 6:30 AM.

15. Do you like to go camping ___ → Camping when? In summer? On weekends? In the mountains? But we need time preposition. Common: in summer or on weekends. Let’s use in summer.

16. My father has a new job. He goes to work ___ → Goes to work at what time? Or on what days? Usually: at 8 AM or on weekdays. Let’s use at 8 AM.

Now, let’s list all answers clearly:

1. in January (given)
2. in June (example — you can change to your month)
3. in 2010 (example — your birth year)
4. at 8 AM
5. at 7 o’clock
6. at 10 PM
7. in the morning
8. at noon
9. in winter
10. on Monday
11. in the evening
12. on weekdays
13. in 1969
14. at 6:30 AM
15. in summer
16. at 8 AM

Note: Some answers can vary based on context, but these are grammatically correct and follow the rules of at/in/on for time.

Final Answer:
1. in January
2. in June
3. in 2010
4. at 8 AM
5. at 7 o’clock
6. at 10 PM
7. in the morning
8. at noon
9. in winter
10. on Monday
11. in the evening
12. on weekdays
13. in 1969
14. at 6:30 AM
15. in summer
16. at 8 AM