Do I need to sign the word 'are'?
No, you do not! ASL does not use English 'to be' verbs like 'am,' 'is,' or 'are.' You simply sign 'HOW' and 'YOU,' and the grammar is conveyed through your facial expression.
Why do I have to furrow my eyebrows?
In ASL, facial expressions act as grammar. Furrowing your eyebrows indicates a 'wh-question' (questions asking who, what, where, when, why, or how). If you raise them instead, it looks like a yes/no question, which changes the meaning.
Can I sign this with just one hand?
The standard sign for 'HOW' uses two hands, but in casual, fast-paced conversation, you might see fluent signers use a one-handed version of 'HOW' followed by the point for 'YOU.' As a beginner, it is best to master the two-handed version first.