1. 到 (dào): This is the most common and versatile way to write "to" in Chinese. It can be used for expressing direction, destination, or a point in time.
* Example: 我要去学校。 (Wǒ yào qù xuéxiào.) - I am going to school.
* Example: 他要到明天才能回家。 (Tā yào dào míngtiān cáinéng huíjiā.) - He won't be able to go home until tomorrow.
2. 给 (gěi): This character is used to express "to" in the sense of giving something to someone.
* Example: 我给朋友送礼物。 (Wǒ gěi péngyou sòng lǐwù.) - I give a gift to my friend.
* Example: 他给老师写了一封信。 (Tā gěi lǎoshī xiě le yī fēng xìn.) - He wrote a letter to the teacher.
3. 对 (duì): This character is used to express "to" in the sense of speaking or doing something towards someone.
* Example: 我对他说了一句话。 (Wǒ duì tā shuō le yī jù huà.) - I said a sentence to him.
* Example: 他对工作很认真。 (Tā duì gōngzuò hěn rènzhēn.) - He is very serious about his work.
4. 向 (xiàng): This character is used to express "to" in the sense of facing or directing towards something.
* Example: 他向我走来。 (Tā xiàng wǒ zǒu lái.) - He walks towards me.
* Example: 她向东走。 (Tā xiàng dōng zǒu.) - She walks eastwards.
5. 对于 (duìyú): This phrase is used to express "to" in the sense of relating to or concerning something.
* Example: 对于这个问题，我有一些想法。 (Duìyú zhège wèntí, wǒ yǒu yīxiē xiǎngfǎ.) - I have some ideas about this problem.
* Example: 对于她的建议，我很赞同。 (Duìyú tā de jiànyì, wǒ hěn zàntóng.) - I agree with her suggestion.
The specific character you need to use will depend on the context of your sentence.