Both constructions "kei te _" and "e _ ana" are used to show the present tense or a state of being in Māori. For a more detailed explanation click here. e.g. Kei te pēhea koe - How are you E pai ana ahau - I am good
It can also express present tense verbal phrases e.g. Kei te haere ahau - I am going E waiata ana ahau - I am singing