Formal:
* 我想要 (wǒ xiǎng yào): This is the most common and neutral way to express "I want". It literally translates to "I want to".
* 我想要 (wǒ yào): This is a more concise and direct way to say "I want", but it can be considered less formal than "我想要".
Informal:
* 我想要 (wǒ xiǎng yào): This is still a common way to say "I want" in informal contexts.
* 我想 (wǒ xiǎng): This is a shorter and more informal way to say "I want". It literally translates to "I think".
* 我要 (wǒ yào): This is the most informal way to say "I want". It literally translates to "I will".
Example:
* 我想要一杯水。 (wǒ xiǎng yào yī bēi shuǐ) - I want a glass of water.
* 我想要吃饺子。 (wǒ xiǎng yào chī jiǎozi) - I want to eat dumplings.
* 我想吃冰淇淋。 (wǒ xiǎng chī bīngqílín) - I want to eat ice cream.
* 我要喝茶。 (wǒ yào hē chá) - I want to drink tea.
The best way to choose the right phrase is to consider the situation and your relationship with the person you're talking to.