A.l can swim.

  We can go there by bus.

=> Corrected​ punctuation.​

 You can drawing picture --> You can draw a picture.

=> Corrected: The sentence is corrected grammatically.​

B. It is punny --> It's Funny.

  Can I help you? (Correct)

 Do you have a dog? --> Do you have a puppy?

=> Your sentence has a correct grammatical structure, but this has the correct usage/expression.​