Question

5. His behaviour vexes me.
change into passive​

Answer 1

Answer:

Remember, passive is used to insist on what has already been said but seems less severe. Due to this, therefore, passive is applied by changing it to a subject from the noun in the sentence and bringing out the intended meaning clearly to the audience.

Answer 2

Answer:

I am sometimes vexed at his behaviour.

or, Sometimes I am vexed at his behaviour.

or, I am  vexed at his behaviour sometimes.