What are Prepositions of Time?

Prepositions of time are small but important words. They tell us when something happens.

In English, the most common prepositions for time are at, in, ， 和 on. Each one has specific uses.

When Do We Use 'At' for Time?

我们使用 at for very specific points in time.

• Exact Times: 使用 at for clock times. For example, The meeting starts at 9 AM.
• Parts of the Day (Specific): 使用 at 用于 night, midnight, ， 和 noon. 例如，, I often read at night.
• Holiday Periods: 使用 at for general holiday periods, but not specific days. For example, We visit family at Christmas.
• Meal Times: 使用 at for meal times. For example, Let's meet at lunchtime.

When Do We Use 'On' for Time?

我们使用 on for specific days and dates.

• Days of the Week: 使用 on for any day of the week. For example, I have a class on Tuesday.
• Specific Dates: 使用 on for full dates, including the day. For example, Her birthday is on May 17th.
• Special Days: 使用 on for specific named days. For example, We celebrate on New Year's Day.
• Weekends (UK English): In UK English, people often say at the weekend, ，但是 on the weekend is also common, especially in US English. Both are acceptable.

When Do We Use 'In' for Time?

我们使用 in for longer periods of time.

• Months: 使用 in for months of the year. For example, My vacation is in August.
• Seasons: 使用 in for seasons. For example, It often snows in winter.
• Years: 使用 in for years. For example, I was born in 2000.
• Decades and Centuries: 使用 in for longer historical periods. For example, Life was different in the 1980s.
• Parts of the Day (General): 使用 in 用于 the morning, the afternoon, ， 和 the evening. 例如，, I like to exercise in the morning.

示例

• The train leaves at 6:30 PM.
• I usually wake up at dawn.
• They have a party on Saturday.
• The festival starts on June 21st.
• We often go to the beach in summer.
• She will finish her studies in 2025.
• I'll call you in the afternoon.

练习

西班牙语母语者常犯的错误

Spanish speakers sometimes make mistakes with prepositions of time because the Spanish word 'en' can cover many situations where English uses at, in, 或 on.

• 使用 in for days: A common error is saying in Monday 而不是 on Monday. Remember, for days, always use on.
• 使用 on for months/years: Another mistake is on July 或 on 2020. For months, seasons, and years, you must use in.
• 令人困惑 at night 和 in the morning: Remember the specific phrases: at night, at midnight, at noon, ，但是 in the morning, in the afternoon, ， 和 in the evening.

常见问题

What is the main difference between 'at', 'in', and 'on' for time?

The main difference is specificity. Use at for precise times (e.g., at 3 PM). Use on for specific days and dates (e.g., on Friday, on July 4th). Use in for longer, less specific periods (e.g., in August, in 2024).

Can I say 'on the weekend' or 'at the weekend'?

Both are correct! At the weekend is more common in British English, while on the weekend is more common in American English. You can use either.

How are prepositions of time tested in the B1 Preliminary exam?

In the B1 Preliminary exam, prepositions of time like at, in, ， 和 on are often tested in the Reading and Writing parts, especially in 'Multiple-choice cloze' tasks (Part 5) or 'Open cloze' tasks (Part 6), where you need to choose or provide the correct word to complete a sentence.

Why do we say 'at night' but 'in the morning'?

These are fixed expressions in English. There isn't a simple grammatical rule, but it's important to learn them as they are. So, it's always at night, at midnight, at noon, ，但是 in the morning, in the afternoon, ， 和 in the evening.