We stay in a New Zealander's house, with 2 people in one group, as part of a school event.
We are going to stay in a New Zealander's home with 2 people in a group, as part of a school event.
「NZの人」→「New Zealander」
単純にホームステイを説明するときに「We stay in a New Zealander's house, with 2 people in one group, as part of a school event.」と表現します。
が、これから実際にニュージーランドに行く場合は、
未来形を使って、
「We are going to stay in a New Zealander's home with 2 people in a group, as part of a school event.」
と表現しましょう。
シンガポール 
