This document discusses the proper use of the prepositions "for" and "since" with the present perfect and past simple tenses. "For" is used with periods of time to indicate how long something has been happening, such as "She lived in Italy for twenty years." "Since" is used to refer to a specific date or point in time to indicate something that began then and continues, like "They have stayed in Italy since September."

1. FOR OR SINCE? Present Perfect and Past Simple

2. We use FOR with periods of time. We use SINCE with dates and points in time.

3. FOR Examples: - She lived in Italy for twenty years . - They have worked in this office for two months. - We stayed at that hotel for six days . - My parents have lived in this house for a long time .

4. SINCE Examples: - They have stayed in Italy since September . Mary has studied English since 2007. Have they been here since 5:00 ? - They haven’t come since last month .

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