决定

Using 决定 is straightforward because it mimics English grammar closely. You can use it as a verb: 我决定去中国 (I decided to go to China). You can also use it as a noun: 这是一个好决定 (This is a good decision). If you want to sound more natural, use the structure 做决定 (to make a decision). It is like adding a bit of weight to your choice. Don't overthink the grammar; it is very friendly to beginners.

Use it when the 'what' and 'if' are finally settled. Use it at a restaurant when the waiter is staring you down. Use it with your partner when picking a travel destination. It is perfect for professional settings too. If you are in a meeting and a plan is finalized, 决定 is the star of the show. It signals that the talking is over and the action is beginning.

Avoid using 决定 for very tiny, subconscious choices. You don't 'decide' to blink or 'decide' to breathe. Also, if you are just 'thinking' about something, don't use it yet. 决定 implies a finished process. If you are still weighing options, use 考虑 (to consider) instead. Using 决定 too early might make you sound more certain than you actually are. Don't let your friends hold you to a 'decision' you haven't actually made!

In Chinese culture, decisions—especially big ones—often involve the whole family. While 决定 sounds individualistic, you will often hear 我们决定 (we decided). This reflects a collective mindset. Historically, the character 决 related to breaching a dike to let water flow. It suggests a powerful, irreversible release of intent. Once the water flows, there is no turning back. It is a word with a lot of hidden momentum.

If you want to sound more formal, you might hear 决议 (a formal resolution). In casual speech, people often say 定了 (settled) to mean the decision is done. If you are struggling to choose, you might say 还没定 (not yet settled). Another common one is 拿定主意, which is a more idiomatic way to say you've made up your mind. Stick to 决定 for now, and you will always be understood.