Ответ:

  1. I want to go to the swimming pool tomorrow.
  2. She needs a blue pen.
  3. I want to have a party.
  4. We need to go shopping.
  5. She wants to go to the concert at the weekend.
  6. She wants to visit it.

Need expresses necessity; want expresses a wish or desire. Перевод: «need» — «нуждаться, быть необходимым», «want» — «хотеть».