T greets students and asks them if they are certain or uncertain about Big Bang,Evolution, Gravity etc like theories. T may write a statement on WB and ask Ss if they are certain or uncertain about it. Students work together to guess the meanings and find synonyms and antonyms of certain and uncertain.

T draws two columns and writes Certain in one column and Uncertain in another column. Then he says in a very firm voice I'm convinced. Then he asks students if convinced should go in the Certain or Uncertain column. Students work together and continue with the other words like definitely, doubtless, positive, sure, without question, doubtful, to have reservations, unsure, convinced etc. They put the words in appropriate columns and drill the pronunciation of the words.

Students work together, rewrite the sentences given by the teacher replacing underlined words with their synonyms. T checks answers in open class.

Teacher shows students picture of Sydney and puts them a question: Have you ever been to Sydney? Teacher makes everybody say yes to this question. Then he shows them another picture and asks: How long did the journey last? T elicits an answer from students. Then he asks rest of the class if they think the students really did go to Sydney. Students play " The Truth or a Lie" game.

Ss sit together and discover who they talked to and decide who was llying or telling the truth and why. They are encouraged to use the vocabulary for showing certainty .