Understanding 'For' and 'Since' Usage

The video tutorial explains the use of 'how long', 'for', and 'since' in the present perfect tense. It begins with an introduction to time expressions, followed by detailed explanations and examples of using 'for' and 'since' to describe the duration and starting point of actions. The tutorial includes gender-specific examples and concludes with a summary of the key points.

What does 'how long' refer to in terms of time?

• The frequency of an event

• The exact end time

• The specific start time

• The duration or length of time

Which word is used to describe a period of time in the present perfect tense?

• During

• For

• By

• Until

In the sentence 'I have studied for two years', what does 'for' indicate?

• The duration of the action

• The frequency of the action

• The end of the action

• The start of the action

How would you express the start of an action using 'since'?

• By mentioning the duration

• By stating the end time

• By indicating the start time

• By describing the frequency

If someone says 'I have studied since 2018', what are they indicating?

• The action occurs every year

• The action will start in 2018

• The action started in 2018

• The action is completed

What is the main difference between 'for' and 'since'?

• 'For' indicates start time, 'since' indicates duration

• 'For' indicates duration, 'since' indicates start time

• Both indicate the same thing

• Neither indicates time

How do you change the verb form when referring to a female subject in present perfect?

• Use 'has' instead of 'have'

• Use 'have' instead of 'has'

• Use 'had' instead of 'have'

• Use 'having' instead of 'have'

In the sentence 'She has studied for one year', what does 'one year' represent?

• The start time

• The frequency

• The end time

• The duration

What does the phrase 'how long' help to determine in a question?

• The exact date

• The length of time

• The location of an event

• The frequency of an event

Which of the following is a correct use of 'since'?

• I have been here since two hours

• I have been here since tomorrow

• I have been here since a long time

• I have been here since 2 PM