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Since For

The use of the prepositions 'since' and 'for'. 

The above two prepositions are quite difficult because we often use them incorrectly.

 ' since ' is used with  point of time .

' for ' is always used with period of time.

Hence ' since ' is used in instances such as these:

since Monday, since 1999, since January, since morning, since 10am etc...

On the other hand ' for ' is used in instances such as:  

for two days, for three hours, for ten years, for five months etc...

It would be erroneous to say since two hours because two hours refers to period of time and not point of time.

For e.g. :

He has been ill for ( and not since) two days.