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This task doesn't have audio. Read the question below and select the correct answer.

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Which sentence correctly uses for and since?

I have been working here since three years.

Since should be used with a specific point in time, not a duration like three years.

I have been studying for the exam since last week.

I will focus on this project for tomorrow.

For should indicate a duration, not a specific future time like tomorrow.

She has lived in this city for 2010.

Since should be used to indicate a specific year (e.g., since 2010), while for indicates a duration of time.

For is used with periods of time (e.g., days, weeks), while since is used with specific dates or points in time.