1. The most common sign:
* "Sit" is a simple sign with the dominant hand held in a fist, palm facing the signer, and moved down in a small arc from chest level to the lap.
* "Down" is a sign with the dominant hand held in a flat hand, palm facing the signer, and moved downward from a high position to a low position.
You can combine these two signs to create "sit down," either by signing them consecutively or by adding a slight "downward" motion to the "sit" sign itself.
2. "Sit on the floor":
* This sign uses the "floor" sign (index finger pointing down) followed by the "sit" sign.
3. "Take a seat":
* You can sign "seat" (a "C" handshape moving from the signer's chin towards a chair) followed by the "take" sign (using the "hold" sign with a quick "pinch" motion at the end).
4. "Sit down, please":
* To add politeness, you can use the sign for "please" (fingers curled inwards, palm facing the signer, moving slightly back and forth).
It's important to remember that context is crucial in ASL. The specific sign and how it is used will depend on the situation and your intended meaning.
For a more visual understanding, try searching for "sit down ASL" on YouTube or other platforms. There are many videos available that demonstrate the signs and their variations.