1. If Descartes’s aim is to find certainty, why does he proceed by doubting as many things as he can?
He feels that as long as he goes on believing his old beliefs, laziness and habit will block him from receiving any truths. He feels that if he regards his beliefs in the same way as he does any falsehoods he can remain unbiased when judging information and only then will he receive real truths.
2. What reason does he give for doubting that the senses give knowledge?
That a man asleep can have a realistic dream that he is having the same experiences as a man that's awake.
3. What does the experience of “dreams” show us concerning the senses?
He talks about how real dreams appear even though they are proven