Formal:
* 你喺度嗎? (nei sei dou maa?) - This is the most literal translation and is suitable for formal situations.
* 你喺屋企嗎? (nei sei uk hei maa?) - This means "Are you at home?" and can also be used in a formal setting.
Informal:
* 你喺唔喺到呀? (nei sei m sei dou aa?) - This is a more casual way to ask.
* 你喺邊呀? (nei sei bin aa?) - This means "Where are you?" and can be used to ask if someone is in a specific location.
Other:
* 你喺唔喺入面? (nei sei m sei jap mein?) - This means "Are you inside?" and is specific to asking if someone is in a room or building.
Note: The tone of the question can change the meaning. For example, "你喺唔喺到呀?" can be used to ask if someone is present, but it can also be used to express surprise or annoyance if the person was expected to be there.
The best way to choose the right phrase is to consider the context and your relationship with the person you are speaking to.