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According to my textbook 简明汉语语法 the parts after the verb 写 are so called complements, they are strictly differentiated from adverbs.
both complements are called:
I assume the meaning of 写完 is "to write (and it is completed)". However, i can not find out myself what the difference to 写得完 is?
写得完: possible to complete writing
写完: complete writing
Beginners often learn 能+verb first, but in many cases, verb+得+complement sounds much more natural when they want to express can/be able to + verb.
I'm aware of some languages, e.g. Japanese and sometimes English, that don't always strictly distinguish these two kinds of expressions, but Chinese does. Always keep in mind that 写得完 is stative while 写完 is dynamic.
I am not sure if this answer is correct or contributes to your understanding, here is my interpretation:
写完, as you have put it, means some piece of writing is completed.
写的完 the stresses the ability to complete something written. E.g. 这么长的文章你写得完吗？ Are you able to finish writing such a long article/essay?
I think you already know 看得懂 where 得 is to emphasize the ability to understand something by reading (able to read and understand). E.g. 这个汉字你看得懂吗？ Can you read this Chinese character?
not complete writing (probably on purpose), which is rather uncommon and has only limited use. The usual expressions we use are 写完了 and 没写完.
Nov 8, 2014 at 16:29