He is upset.
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Expressing Degrees of Certainty
Definition:

In American speech Degrees of Certainty means how confident you are about how correct a statement is - you are saying.

If you are 100% sure about the topic you are discussing, you must use is. You must be 100% sure the topic is correct. Is, is used for a statement of fact. (Example 1)

If you are 90% sure about the topic you are discussing, the speaker uses must be. (Example 2)

If you are 60% sure about the topic you are discussing, the speaker uses may be, maybe, might be, or could be. These words are discussing suspicious or uncertain thoughts about the topic you are discussing. (Example 3, 4, and 5)

Example:

1. Tom is sad.

2. Tom must be sad.

3.Tom may be sad.

4. Maybe tom's sad.

6. Tom might be sad.

7. Tom could be sad.

Definition:

Must be is also used for when you have complete confidence in a topic you are discussing but you have no idea if its completely true or completely false.

Example:

Tom is not here. He is usually in class everyday. Tom must be sick.

*You have no idea if Tom is actually sick or not, but you have complete confidence that he is.


He must be rich.
 
Exercise
Choose the correct Degree of Certainty for each sentence. Look at the percentage next to the question, then look above to match the Degree of Certainty with the percentage. The first sentence has been completed for you. The exercise will be said in full on the Exercise Answers page. English Logic will put a checkmark ) next to your correct answers.
1.
60%
Terri a girl's name.
2.
100%
My mom a slow driver.
3.
100%
My dad sick.
4.
90%
Your shoes in the closet.
5.
100%
Tom sad.
6.
60%
John on time if he woke up early.
7.
100%
Seth late.
8.
100%
Jake at the store.
9.
60%
Jake at home.
10.
90%
Your keys on the table.


You have right answers out of .

Score: %


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