The Intricacies of 'Since' vs. 'For': A Comprehensive Guide

Learning when to use 'since' and 'for' can be tricky. Both words are used to talk about time. However, they are used in different ways. Let’s explore how to use each word correctly.

Understanding 'Since' and 'For'

'Since'

We use 'since' to talk about a starting point in the past. It tells us when something began. 'Since' is used with a specific time.

Examples:

1. Correct:

   • "I have lived here since 2015."
   • "She has worked there since last year."
   • "We have been friends since January."

2. Incorrect:

   • "I have lived here since six years." ❌
   • "She has worked there since a long time." ❌
   • "We have been friends since three months." ❌

Why?

• 'Since' needs a specific starting point, like a year, a month, or a specific date.

'For'

We use 'for' to talk about a duration of time. It tells us how long something lasts.

Examples:

1. Correct:

   • "I have lived here for six years."
   • "She has worked there for a long time."
   • "We have been friends for three months."

2. Incorrect:

   • "I have lived here for 2015." ❌
   • "She has worked there for last year." ❌
   • "We have been friends for January." ❌

Why?

• 'For' is used with a period of time, like 'two weeks' or 'five days'.

Comparison Table: 'Since' vs. 'For'

How to Use 'Since' and 'For' Correctly

1. Identify if you are talking about a starting time or a duration.

   • Are you saying when something started? Use 'since'.
   • Are you saying how long something lasts? Use 'for'.

2. Choose the right word based on the time expression.

   • Use 'since' with specific times: years, months, specific dates.
   • Use 'for' with durations: days, months, years.

3. Practice with real-life scenarios.

   • Imagine you're writing an email to a friend: "I have been studying for three hours."
   • When texting a friend: "I have been studying since 10 AM."

Common Mistakes

Mistake 1

• Wrong: "I have been here since five days."
• Right: "I have been here for five days."
• Why: 'Five days' is a duration, not a starting point.

Mistake 2

• Wrong: "I have known her for 2010."
• Right: "I have known her since 2010."
• Why: '2010' is a specific starting point.

Mistake 3

• Wrong: "He has worked here since three years."
• Right: "He has worked here for three years."
• Why: 'Three years' is a duration, not a specific starting time.

Quick Summary / Cheat Sheet

• Use 'since' for specific starting points in the past.
• Use 'for' to talk about how long something lasts.
• 'Since' + specific time (year, month, date).
• 'For' + duration of time (days, weeks, years).
• Practice Tip: Use Blindspot to check your sentences and find your grammar blind spots.

FAQ

Q1: Can I use 'since' with a duration?

• A1: No, 'since' is used with a specific starting point.

Q2: Can I use 'for' with a specific time?

• A2: No, 'for' is used with durations, not specific times.

Q3: What if I’m talking about something that is still happening?

• A3: You can use both 'since' and 'for', but make sure to use them correctly. For example, "I have been studying since 8 AM" or "I have been studying for two hours."

Q4: How can I improve my sentences?

• A4: Use tools like Blindspot to practice and find areas you need to improve.

Practice Exercise

Try to rewrite these sentences using 'since' or 'for':

1. I have been waiting (2010).
2. She has worked here (two years).
3. They have traveled (last month).

Answers:

1. I have been waiting since 2010.
2. She has worked here for two years.
3. They have traveled since last month.