How student write letter to say they are sick to their teachers?

From,

xxxx

class/grade- xx

ph-no- (if you have)

To,

the class teacher

class/grade - xx

school name

Sub- Leave letter (under line it)

Respected Madam/Sir,

As I am suffering from heavy fever and cold (change accourding to your illness). I was (will be) unable to attend classes from --/--/---- till --/--/---.

So, kindly grant me leave for the reason given above.

Thanking you,

Your Sincerely

xxxx

Date --/--/----

place- xxx