natural
The German word 'natürlich' is an adverb that can be translated to 'natural' in English. It is used to express that something is normal, expected, or logical, just like in English. For example, 'Es ist natürlich, dass es regnet, wenn es bewölkt ist.' translates to 'It is natural that it rains when it is cloudy.'.
Of course I can do that.
In this sentence, 'natürlich' can be closely translated to 'of course' in English. It is used to indicate that the speaker finds the matter at hand to be obvious or not surprising.
The water is naturally clear.
Here, 'natürlich' is used in the sense of 'naturally' or 'by nature'. The sentence is implying that the clarity of the water is a natural, inherent characteristic.
He is right, of course.
In this particular example, 'natürlich' is used to emphasize that it's obvious or generally accepted that 'he' is right. It implies that there is no doubt or discussion about his correctness.