This usage implies a logical conclusion derived from a previously mentioned statement or situation. It’s often used to signal a shift in thought or to add context.

This meaning indicates a cause-and-effect relationship, where one situation arises due to another. It is commonly used to explain reasons.

This phrase is used to explicitly state the reason for a situation or decision, often to clarify or justify something that was said.

This usage introduces a condition or premise that affects the following statement. It's often used to acknowledge a certain situation as a basis for what follows.