(a) Computer is one of the greatest inventions of modern science. (Positive) (b) Computer is a blessing on earth. (Negative) (c) Though it is a blessing, it has dark sides. (Simple) (d) Computers are nowadays being used in almost every sphere of life. (Active) (e) We cannot but depend on it. (Affirmative) (f) No one can deny its necessity. (Interrogative) (g) It is the most used device in our life. (Comparative) (h) It helps us a lot. (Passive) (i) Because of its usefulness, it has become very popular. (Compound) (j) Without computer, we cannot imagine our modern life. (Complex)