Identify the part of the sentence which is grammatically incorrect: (1) Even in thick fog, (2) the tower of the Taj (3) can be seen clearly (4) and so do those of the Agra fort. (1) The ship had sank (2) in the Pacific (3) before the distress signal (4) was sent. (1) Rajiv drove (2) as fastly as he could (3) but failed to (4) overtake the train. (1) I don’t wish (2) to buy a new camera (3) as my old one (4) works perfect. (1) The meanings of certain (2) difficult terms and phrases (3) are given (4) in the bottom of the page.