Question

how does holmes make sure that watson does not guess that he is pretending​

Answer 1

Answer:

Holmes refuses to let Watson examine him and instead insists that Watson persuade Mr. Culverton Smith to visit his lodgings in Baker Street. The reason Holmes did not let Watson know that he was merely pretending to be sick is simple as Watson is not a skilled liar.

Hope it helps :)

Answer 2

Answer:

Holmes refused to let Watson examine him, instead insisted him to persuade Mr. Culverton Smith of 13 Lower Burke Street.