In the English language, the words some and any are quantifiers used to indicate an unspecified amount or number of something. Their usage depends on the context of the sentence, particularly whether it is affirmative, negative, or interrogative. Below is a detailed explanation of when to use some and any.

1. Usage of Some:

• Affirmative Sentences:
  Some is typically used in positive statements. For example:
  "I have some friends in London." This indicates that the speaker has an unspecified number of friends, but it is more than one.
• Requests and Offers:
  Some can also be used in polite requests or offers. For example:
  "Would you like some coffee?" Here, it suggests a positive expectation that the person may want coffee.

2. Usage of Any:

• Negative Sentences:
  Any is commonly used in negative statements. For example:
  "I don’t have any money." This implies that the speaker has no money at all.
• Interrogative Sentences:
  Any is often used in questions. For example:
  "Do you have any questions?" This indicates an open-ended inquiry about the presence of questions.
• Conditional Sentences:
  Any can also appear in conditional sentences. For example:
  "If you have any problems, let me know." It suggests that if there are problems, the speaker should be informed.

3. Summary of Differences:

• Some is used in affirmative sentences and polite requests/offers.
• Any is used in negative sentences, questions, and conditional sentences.

In conclusion, understanding the context of the sentence is crucial for determining whether to use some or any. This distinction is important for clear and accurate communication in English.