For indicating time:
* Because: If the "since" clause explains a reason rather than simply marking a point in time. (e.g., "Since it's raining, I'll stay home" -> "Because it's raining, I'll stay home")
* From: Indicates a starting point in time. (e.g., "Since Monday" -> "From Monday")
* After: Indicates a point in time after an event. (e.g., "Since the accident..." -> "After the accident...")
* Following: Similar to "after," more formal.
* Ever since: Emphasizes the duration from a past point. (e.g., "Since the party..." -> "Ever since the party...")
* As of: Marks a precise starting point. (e.g., "Since January" -> "As of January")
* Starting with: Emphasizes the beginning of a period.
* During: When referring to the period between two points in time.
* For: Indicates duration. (e.g., "Since 2010" -> "For 13 years")
For indicating reason or cause:
* Because: The most straightforward replacement.
* As: Indicates a causal relationship, often more formal.
* Given that: More formal, suggests a premise.
* Inasmuch as: Very formal, similar to "given that."
* Seeing that: Slightly informal, indicating visible evidence of a reason.
* Considering that: Takes into account a factor.
* Due to: Indicates causality, often with a preceding noun phrase. (e.g., "Since the rain..." -> "Due to the rain...")
* Owing to: Similar to "due to," more formal.
* Thanks to: Implies a positive outcome despite the reason.
For indicating consequence (less common):
* Therefore: Indicates a logical consequence.
* Thus: Similar to "therefore."
* Consequently: Indicates a result.
* Hence: Similar to "therefore," more formal.
To choose the best replacement, carefully consider what role "since" plays in your sentence. Provide a sentence using "since" and I can offer a more specific and accurate replacement.