Formal:
* 我掛住你 (ngo gwa jau nei) - This is the most common and formal way to say "I miss you." It literally translates to "I hang on to you."
* 我思念你 (ngo sin nin nei) - This is a more literary and poetic way to say "I miss you." It means "I think of you."
Informal:
* 我好掛住你 (ngo hou gwa jau nei) - This is a more informal version of "I miss you." It means "I miss you very much."
* 我好想你 (ngo hou soeng nei) - This is another informal way to say "I miss you." It means "I miss you very much."
* 我想你 (ngo soeng nei) - This is the most casual way to say "I miss you." It means "I miss you."
Other options:
* 我唔習慣冇你 (ngo m hou gwai m mou nei) - This means "I'm not used to not having you."
* 我成日諗起你 (ngo sing jit jam hei nei) - This means "I think about you all the time."
Remember that the best way to say "I miss you" in Cantonese depends on the situation and who you're talking to.