Select the correct direct form of the given sentence.

My teacher forbids to trust one's relatives.

My teacher says, "Never trust your relatives." 

The correct direct form of the given sentence is:

My teacher says, "Never trust your relatives."

This is because direct speech is the exact words that someone spoke. In the direct form, the subject and tense of the verb do not change.

The other options are incorrect because they change the direct form of the sentence in some way:

• My teacher says, "Never trust my relatives." - This sentence changes the second person pronoun "your" to the first person pronoun "my."
• My teacher says, "Never trusted your relatives." - This sentence changes the present tense to the past tense for the verb "trust."
• My teacher said "Never trust your relatives." - This sentence changes the present tense to the past tense for the verb "says."