Is Sonnet 18 written in iambic pentameter
Yes.
I think most/all the sonnets are.
http://www.google.com/search?q=sonnet+18&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
I think most/all the sonnets are.
http://www.google.com/search?q=sonnet+18&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a