Final answer:
The past simple tense is used for actions that finished in the past, while the present perfect tense is used for actions that continue from the past until now. 'Since' is used to indicate the starting point of an action and 'for' is used to indicate the duration.
Step-by-step explanation:
The past simple tense is used to talk about actions or situations that began and finished in the past. Examples of sentences using the past simple tense include: 'I walked to school yesterday' and 'She cooked dinner last night'.
The present perfect simple tense is used to talk about actions or situations that continue from the past until now. Examples of sentences using the present perfect simple tense include: 'I have lived in this city for five years' and 'She has studied French since she was a child'.
With the present perfect tense, we use 'since' to indicate the starting point of the action or situation. For example, 'I have been here since morning'. We use 'for' to indicate the duration of the action or situation. For example, 'She has been studying for two hours'.
Learn more about Tenses in English