The third and final de particle is probably the most difficult for English speakers to get used to. It's called 双人得 (shuāngrén de) because the 彳 radical it contains is often referred to as 双人 - “double person”.
This 得 is used as part of various verbal complements. That probably doesn't mean a lot to you if you haven't studied grammar before. A complement is something that appears right after the verb and adds more information about it.
Verbal complements in Chinese can be categorized in many different ways depending on who you ask, but here's one way to do it:
Direction complement
Potential complements
Degree complements
Result complements
Rather than trying to analyze all of these, though, we'll break down the two that involve 得: potential complements and degree complements.
The potential complement is attached to a verb to show its potential. That is, the potential complement indicates whether an action can or can't happen. If the action can happen, 得 is used. If it can't happen, 不 is used.
Some examples of actions that can happen (with 得):
做得到
听得懂
看得懂
看得清楚
And some examples of actions that can't happen (with 不):
做不到
听不懂
看不懂
看不清楚
There's a huge variety of things that can come after the 得 or 不. Remember that with the potential complement, the action is hypothetical. It hasn't been done, or attempted and failed. The potential complement merely indicates what would happen if the action were attempted.
Some full examples sentences of the potential complement:
我只有戴眼镜的话才看得清楚。
这么多饭 - 你能吃得完吗?
太晚了,机票都买不到了。
We won't go into the potential complement in more detail here, as this is just a summary of Chinese de particles. Also remember that you shouldn't spend too much time trying to analyze grammar. It's far more effective to listen to a lot of real Chinese and try to use it as much as possible. Use this site as a reference to get some basic understanding, then get out there and use your Chinese in the real world!
The other kind of verbal complement that 得 appears in is the degree complement. This complement appears similar to the potential complement described above, but it's not the same. The degree complement is the most general-purpose of the verbal complements in Chinese, and is used simply to add descriptive information to the verb or to talk about the extent (the degree) the action goes to.
This is quite vague, unfortunately, but it's about as specific as you can get with the degree complement. As usual, we think it's best to just get as much exposure to real language and get a feel for it, rather than trying to analyze and memorize grammar structures. But it's helpful to have a basic grasp of the grammar before you set off on your quest, so read on.
The degree complement always uses 得, and the basic structure is:
[verb] 得 [description]
There's huge scope for what you can put in the [verb] and [description] slots, but it tends to be some sort of comment or description of the action in the verb. It is also used to talk about the degree to which the action happens, hence the name. Let's have a look at some example sentences:
你说得非常好。
他做得不好。
她长得很高。
Again, we won't go into too much detail about the degree complement here, as this is just a summary of Chinese de particles.
Just so you know, the character 得 isn't just a particle. It has two other pronunciations, each with different uses.
When 得 is pronounced dé in second tone, it's a verb meaning “to get” or “to acquire”.
When 得 is pronounced děi in third tone, it's a modal verb meaning “must” or “have to”.
Now let's recap with a very short summary of the Chinese de particles.
的 is marks possession
地 marks adverbs
得 appears in verbal complements
the potential complement
the degree complement
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