Is it okay if I want to say 做完 (finish working)? I have come across 吃完 (finish eating). Is it possible to say finish [doing bla bla] by writing ...完?
... can be filled with 做 or 写 etc...
Just add it to the end of any verb.
If the verb refers to some actions which last for a very short period of time, e.g. sneezing, we do not use "完" to indicate the completion.