I didn't eat meat.

This lesson deals with past and present verb tenses. We have already studied the present and future tense for positive and negative verbs. As a refresher:
-masu -masen	positive present/future negative present/future
Examples: Paati ni ikimasu. Paati ni ikimasen. Koora o nomimasu. Koora o nomimasen. Niku o tabemasu. Niku o tabemasen.	I will go to the party. I won't go to the party. I drink cola. I don't drink cola. I eat meat. I don't eat meat.
Note that desu is an exception to this because the negaive of desu is dewa arimasen or janai desu. To change from present positive to past positive, take off the masu ending and replace it withmashita. To change from a negative present to a negative past, use the masen ending and adddeshita to the end.
Examples: Kouen ni ikimashita. Kouen ni ikimasen deshita.	I went to the park. I didn't go to the park.
Omizu o nomimashita. Omizu o nomimasen deshita.	I drank water. I didn't drink water.
Niku o tabemashita. Niku o tabemasen deshita.	I ate meat. I didn't eat meat.
Hon deshita. Hon dewa arimasen deshita.	It was a book. It wasn't a book.
Note that again desu is an exception. You cannot say janai deshita. This rule will be explained later. Note also the word omizu. Mizu means water. The o is only added to be respectful. Many words often have this 'honorific' o added to the front.
Vocabulary:
-masu -masen -mashita -masen deshita desu dewa arimasen deshita dewa arimasen deshita ikimasu nomimasu tabemasu paati koora niku kouen mizu hon	positive present/future verb tense negative present/future verb tense positive past verb tense negative pase verb tense is isn't was wasn't to go to drink to eat party cola/soda meat park water book