I am not as brave as he. (comparative) = He is braver than I.

I am often written by him.

I am shorter than her.

I am sure that she will succeed in the examination

I am sure that soon photography is my favourite pastime = I am sure that soon  photography will be my favourite pastime.

I am vexed with his behaviour.

I am vexed with what you did.

I asked you what you had thought of me.

I came home yesterday.

I can not be false to my friend.

I can not help doing this. 

I can not make out what he says.

I cannot make out these four boy.

I cannot make out these four boy.

I couldn't but laugh.