Jawaban:
Need = Perlu
Use = Pakai

Penjelasan:

Need adalah perlu. Need di pakai saat kalimat perlu kata need seperti:

Kalimat pendek dengan need: I need to eat. I need to tie my shoes.

Kalimat panjang: I need to eat because i'm hungry, now excuse me because i am about to eat.

Use adalah pakai, Use di pakai saat kalimat mau menjelaskan tentang kamu atau siapa perlu pakai sesuatu:

Kalimat pendek: I usually use shoes.
Kalimat Panjang: I usually use shoes without socks because my legs get itchy when i wear socks.