Talking about Assumptions 

How to "Talk about Assumption" in English

What Do We Mean by Assumption?

Assumptions are ideas or beliefs for which we have no proof or reason. An assumption might be true or not. Specific structures are used in English to convey assumptions.

Modals and Assumptions

The following is a list of modals and semi-modals that are commonly used when expressing assumptions:

Using 'Will'

The modal verb 'will' is used to show that a statement is an assumption. Normally, 'will' has a reference to the present or future, but sometimes it is followed by a perfect infinitive structure which makes it possible for it to refer to the past. 'Will' is commonly used when the speaker feels confident or certain about their assumption.

Example

I thought it will have been finished by Monday.

This sentence expresses an assumption about something that was expected to have finished in the past.

He will know what to do in this situation.

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Using 'Should'

Although the modal verb 'should' is the past tense of the modal verb 'shall,' when we are talking about assumptions, it refers to the present or future; unless there is a perfect infinitive structure after it. Take a look at the following examples:

Example

They should know the results soon.

We should have been graduated by now.

When followed by 'have' + past participle, it refers to an assumption about the past that is not fulfilled.

Using 'Ought'

The modal verb 'ought' is usually used as an alternative for 'should,' but it is considered less common and highly formal.
Like the other modals discussed so far, 'ought' refers to the present or future tense unless we use have + past participle after it.

Example

They ought to have known the rules.

It ought to be warm enough to go without a jacket.

Negation

As you know, all these verbs are modal verbs, which means they are negated by adding 'not' after them. In this case, we can indicate that we do not think something is true.

Example

It shouldn't take more than 10 minutes.

She will not be at home at this time of the day.

Review

Two modal verbs and a semi-modal are commonly used to talk about assumptions. The table below summarizes their use in different tenses.

Present

Past

Future

Will

Should

Ought to

Quiz:


1.

Which sentence expresses a confident present assumption?

A

She will call you tomorrow.

B

She will be in a meeting right now.

C

She will have finished the project yesterday.

D

She will go to Paris next month.

2.

Which shows an unfulfilled past expectation?

A

We shouldn't have any problems with this plan.

B

They should have arrived by now.

C

They ought to arrive soon.

D

They will arrive on time.

3.

Sort the words to form a correct sentence.

the
documents
be
on
your
desk
.
should
4.

Match each sentence with its correct description.

She will be at the office at this time of the day.
They should have received our package yesterday.
You ought to know this already.
It won't take more than an hour.
Negative future assumption
Unfulfilled past expectation
Present assumption with high certainty
Formal present assumption
5.

Fill the blanks with the appropriate verb form. (There is one extra option.)

He

know the answer to this question.

They

to have received our message yesterday.

She will

finished her homework by now.

She

be at work on a Monday morning.

should
ought
have
will
would

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