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When I am tired I forget about many things.

(a)  

My mom forgot to bring the key.

(a)  

One must remember to help her.

(a)  

Did our little sister forget to close the windows?

(a)  

I believe that our brothers forgot to close them for us. (windows/subject understood)

(a)  

How did you remember that horror movie? (subject understood)

(a)  

Sometimes I forget that one must sleep more.

(a)  

One must remember to listen and study more in that class.

(a)  

I remembered to call him last night.

(a)  

Does she remember my name?

(a)