$\text{I. Relative pronoun:}$
$\text{1. The sentences will help students in studying English which are taken from a book}$
$\text{2. My mother is very strict who you talked to yesterday}$
$\text{3. I couldn't find the letter which the postman had brought yesterday}$
$\text{II. Change into Passive}$
$\text{1. The words have just written on the blackboard by the teacher}$
$\text{2. Their homework has been done for hours by the children}$
$\text{3. Your new bicycle has been stolen for a week}$
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