One kind of complement in Chinese involves putting 到, 给 or 在 after the verb. These are used to indicate direction, target and location, respectively.

到 (dào) indicates that the action has obtained a goal or a certain state. Any verb that uses the complement 见 can also use 到.
给 (gěi) indicates that you have passed something from one person to another.
在 (zài) indicates a person or thing coming to a certain place. It is usually followed my a location or a place.

Subject + Verb + 到 / 给 / 在 ...

Examples

Wǒ zuótiānwǎnshɑnɡ ɡōnɡzuò dào shíèrdiǎnbàn。
我 昨天晚上 工作 到 十二点半。
I worked until 12:30 last night.

Qǐnɡ nǐ zuò zài wǒ pánɡ biānér。
请 你 坐 在 我 旁 边儿。
Please come and sit next to me.

Wǒ jīntiānzǎoshɑnɡ fāle yìfēnɡ diànzǐyóujiàn ɡěi nǐ。
我 今天早上 发了 一封 电子邮件 给 你。
I sent an e-mail to you this morning.