I want to drink cola.

In this lesson, you will learn how to tell someone that you want to do something. Recall that present tense verbs have the -masu ending. In order to change these to the 'want to' ending, drop the -masu and replace it with -tai. Examples: masu form English tai form English tabemasu to eat tabetai want to eat nomimasu to drink nomitai want to drink ikimasu to go ikitai want to go kaimasu to buy kaitai want to buy yomimasu to read yomitai want to read kakimasu to write kakitai want to write mimasu to watch/see mitai want to watch/see kikimasu to listen/hear kikitai want to listen/hear
Examples: Kouen ni ikimasu. Kouen ni ikitai. Gakkou ni ikimasu. Gakkou ni ikitai.	I will go to the park. I want to go to the park. I go to school. I want to go to school.
Now for one more twist. When you use tai with verbs that take o, you can also change the o to ga for emphasis if you want.
Examples: Ringo o tabemasu. Ringo o tabetai. Ringo ga tabetai.	I eat apples. I want to eat an apple. I want to eat an apple.
In the above example, the second sentence just means that you want to eat apples. The third sentence means that you want to eat apples as opposed to something else. It's not really that important of a difference so you can stick with just o if you're more comfortable with it.
Vocabulary: ringo tegami hon kouen gakkou koora o ni ga	apple letter book park school cola object marker particle particle meaning 'to' emphatic object marker
-masu	positive present/future verb tense
-tai	'want to' verb ending