Make a logical guess from evidenceاستنتج من الدلائل

The idea, simply

When you are almost sure because of evidence, use must be: He worked all night. He must be tired. When you are almost sure something is impossible, use can’t be: That can’t be Sara. She is in Paris. Do not use mustn’t for a guess; it means not allowed. For a weaker possibility, go back to might.

Examples

• He worked all night, so he must be tired.

• That can’t be Sara. She is in Paris.

• You must be hungry after that long trip.

Lesson words

• evidenceدليل
  There is no evidence of a problem.
• tiredمتعب
  I am too tired to cook.
• expectيتوقع، ينتظر
  We are expecting a parcel.
• impossibleمستحيل
  It is impossible to park here.
• certainمتأكد تمامًا
  Are you certain about the time?

Lesson exercises

1. Put the words in the correct order.

   Words: all / be / He / he / must / night, / so / tired. / worked

   Answer

   He worked all night, so he must be tired.

2. Complete the gap: He has been travelling all day. He ___ be tired.

   Answer

   must

3. Choose the correct English sentence.

   • She is smiling. She must be happy.
   • She is smiling. She must to be happy.
   • She is smiling. She mustn’t be sad.
   Answer

   She is smiling. She must be happy.

4. The doorbell rings and you are only expecting the delivery driver. What do you say?

   • That must be the delivery.
   • That mustn’t be the delivery.
   • That can’t be the delivery.
   Answer

   That must be the delivery.

   You have strong evidence, so you are almost sure, and you use must be.

5. Work out how someone is from what you can see.

   Model answer

   He worked all night, so he must be tired.

   Compare your answer with the model and check word order, capitals, and punctuation.