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Languages Study | Languages of the East | Japanese III
ÀÓÄÈÎ 325 | GRAMMAR I - 11.01
 
Grammar I - 11.01
～たい - ~tai  
 

You can use a verb stem plus たいです - tai desu to describe your hope or aspiration.

 

It can use が - ga or を - wo [o]  particles.
こんど　の　しゅうまつ　は、
えいが　を　みたい　です。		 I want to see a film this weekend.

kondo-no shuumatsu-wa,
eiga-o mitai desu.

  
こんど　の　しゅうまつ　は、
えいが　が　みたい　です。		 I want to see a film this weekend.

kondo-no shuumatsu-wa,
eiga-ga mitai desu.

  
  As you can see in the first example above, having tai attached to a verb slightly affects the composition of the sentence.
  A verb that takes the particle wo [o] can have either the particle wo [o] or ga when it is followed by tai.
Particles other than wo [o] remain the same.
   
いつか　ちゅうごく　に 　いきたい　です。 I want to go to China someday.

itsuka, chuugoku ni ikitai desu.

  
  The combination of a verb plus たい - tai conjugates as an い-adjective.
あの　人　に　は　もう　会いたく　ありません。 I don't want to see that person any more.
ano hito ni moo, aitaku arimasen.  
セーター　が　買いたかった　から、
デパート　に　行きました。		 I went to a department store, because I wanted to buy a sweater.
seetaa ga kaitakatta kara,
depaato ni ikimashita.		  
   
たがっている - tagatte iru  
  たいです- tai desu sentences are usually not used to report others wishes or aspirations.
メアリーさんは　トイレ　に　行きたい、
と　言って　いました。		 Mary said that she wanted to go to the bathroom.

mearii-san-wa toire ni ikitai,
to itte imashita.

 
  To describe your observation to the effect that somebody wants to do something, you must use a special verb たがっている - tagatte iru instead of たい.
 

This derives from the dictionary form たがる〔欲する〕- tagaru  and indicates "I think that she wants to, because of the way she is behaving."
  It can use particle を - wo [o] only.
   

メアリー さん は
コーヒー を のみたがって います。

 (It seems) Mary
wants to drunk coffee.
mearii-san-wa,
koohii-o nomi-tagatte imasu.