Breakdown of Potilaan kunto kohentuu nukkumalla.
nukkua
to sleep
kunto
fitness
potilas
the patient
kohentua
to improve, to pick up (of a condition)
Questions & Answers about Potilaan kunto kohentuu nukkumalla.
How does the -ntua suffix work in the verb kohentuu?
The suffix -ntua turns a transitive verb into an intransitive, inchoative verb (meaning a change of state happens on its own). The base verb is kohentaa (to improve something). By adding the suffix to get kohentua, the meaning changes to "to improve" or "to get better by itself." This is why kunto (condition) is the subject here and the sentence requires no object.
How would this sentence look if a doctor were improving the patient's condition?
You would drop the -ntua suffix and switch back to the transitive verb kohentaa. The sentence would be something like: Lääkäri kohentaa potilaan kuntoa (The doctor improves the patient's condition). Notice that because the doctor is now acting upon the condition, kunto becomes the partitive object kuntoa.
What grammar structure is used in the word nukkumalla?
This is the adessive case (-lla) attached to the third infinitive (the -ma form of the verb). In Finnish, this specific combination (-malla / -mällä) is used to express "by doing" something. It indicates the exact means or method by which the condition improves—in this case, by sleeping.
Does the word kunto strictly mean a medical "condition"?