Does Snape know?

[sylviablundell2001]

No: HPFGUIDX 81233

Can anyone point me to anywhere in canon where it says that Snape 
knew that Harry would recognise a pensieve and its functions? I ask 
this because, if he did know and still left Harry alone with it, this 
will completely alter my take on Snape's subsequent reaction on 
returning to find Harry messing with his most intimate 
memories.Incidentally, I think it is Snape's own Pensieve. If it is 
DD's and he lent it to Snape knowing Harry would recognise it, that 
opens a whole new can of worms.
Sylvia (who is not fond of worms)