細身だ
My little sister is slender.
私の妹は細身です
My little sister is slender every morning.
私の妹は毎朝、細身です
My little sister swims every morning and is slender.
私の妹は毎朝水泳をし、細身です
My little sister swims every morning, eats regular meals, and is slender.
私の妹は毎朝水泳をし、規則正しく食事を取り、細身です
My little sister swims every morning, eats regular meals, and looks after her health properly, so she is slender.
私の妹は毎朝水泳をし、規則正しく食事を取り、健康をきちんと管理しているので、細身です