Explanation
Express the obligation to do something; 'have to', 'must', 'need to'.
Formation
Verb-ない form (-ない ending is dropped) + なくちゃいけない
Detailed explanation
The ～なくちゃいけない grammar point is used to express that there is an obligation or necessity to do something. It can be translated as 'have to', 'must', or 'need to' in English. This grammar point is mainly used with verbs.
Examples
Shigoto ni ikanakucha ikenai node, hayaoki shinakereba narimasen.
I have to go to work, so I must wake up early.
Shiken ga aru kara, benkyou shinakucha ikemasen.
I have a test, so I must study.
Pasupooto wo koushin shinakucha ikenai node, taishikan ni ikanakereba.
I have to renew my passport, so I need to go to the embassy.
Kyou wa okane wo harawanakucha ikenai kara, ginkou ni ikanaito.
I have to pay money today, so I need to go to the bank.
Practice
Grammar content sourced from hanabira.org.