It is always a good idea to plan your answer before you begin writing. Having a plan means you will leave space to make all the points you want to, rather than risk running out of ideas. You must also refer to the examiner's assessment objectives to ensure you have met the criteria.
Below is a structure that you could use for your answer:
Here are two sample answers that refer to point 2 of the essay plan.
Benedick is seen as a changed man in this section when he is hiding in the orchard. He has overheard his friends talking about how Beatrice is in love with him and he is now convinced that he is also in love with her. He says that he cannot disagree with their statement that "the lady is fair". This is funny for the audience because until this point in the play they have seen Benedick swearing that he would never marry.
In this extract from Act 2 Scene 3, we see a change in Benedick. He has just overheard his friends talking about Beatrice in the orchard. He is unaware that he has been tricked and the dramatic irony creates comedy -- the audience knows that his friends intend for him to fall in love and there is a delight in the apparent success of their plan. He says "They say the lady is fair" and this admission that Beatrice is attractive to him shows that he has changed his mind. Early in the play he described her as "my dear Lady Disdain", implying that he found her disagreeable. The contrast here creates comedy for the audience, which realises that Benedick has been denying his feelings for Beatrice.
Read over the assessment objectives again. Then use the plan and everything you have learned in this section to write your own timed answer.