On-line Te Reo Māori Dictionary

Kei te whātuitui kākahu ia.
He is folding clothes.
Simple sentences: present tense with a verb - kei te

E kōrero ana a Māmā ki te waea me te whātuitui kākahu anō.
Māmā is talking on the phone whilst folding the clothes.
While at the same time/and in addition - me te... anō

Kei te whātuitui au i ngā kākahu
I am folding the clothes.

Kāore au i te whātuitui i ngā kākahu
I am not folding the clothes.