as syafiqah answered its formally correct although the formal form is very rarely used.
"how have you been recently?"
formal : apa khabar kamu kebelakangan ini?
informal : kamu macam mana sekarang? sihat?
"what are you doing this weekend?"
formal : apa awak mahu buat hujung minggu ini?
informal : kamu nak buat apa hujung minggu ni?