For and since

For is used with a period of time and can be used with different tenses.

Since is used with a point in time and is used with the present perfect.

For

• I worked in my last job for five years.
• I am going on holiday for two weeks.
• I have been living here for three months.

Since

• I have been living here since March.
• I have been on holiday since Wednesday.
• I have been waiting since 9:00 am.

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