1
I am nervous about the test.
Point to yourself for 'I', sign 'nervous' by pointing both index fingers downward and shaking the dominant one while showing an anxious face, then sign 'test'.
2
Why are you so nervous?
Point to the person for 'you', sign 'nervous' with your downward-pointing shaking finger and a worried expression, then sign 'why' while furrowing your eyebrows to indicate a question.
3
Don't be nervous, you'll do great.
Sign 'don't', then sign 'nervous' using the downward-pointing index fingers with the dominant finger shaking. Finish by signing 'great' with an encouraging, positive facial expression.