"I want to.../They want to..." (grammar)

I want to.../Do you want to...?

• verb stem + たいです
• verb stem + たいですか
• たい conjugates as an い-adjective
• が or を

I've wanted to...

• verb stem + たいとおもっています。

They want to...

• verb stem + たがっている
• たがる conjugates as an u-verb
• を only

Genki I, Lesson 11.1