我要去廁所。

I have to go to the toilet.

I need to go to the toilet.

I need to go to the bathroom.

I have to go to the bathroom.

Source: Tatoeba

Sentence Composition

1 我 wǒ
  1. I
  2. me
  3. my
=2 要 yāo (bound form) to demand; to coerce
=2 要 yào
  1. to want; to need; to ask for
  2. will; shall; about to
  3. need to; should
  4. if (same as 要是 yàoshi)
  5. (bound form) important
=2 要 yǎo
  1. (archaic) alternative form of 偠 (yǎo)
  2. alternative form of 偠 (yǎo)
  3. used in 要褭／要袅
3 去廁所 qùcèsuǒ to go to the toilet