What Is Their Main Difference?
'Unless' is used in conditional sentences. These sentences set out conditions. When use 'unless,' we show that something will or will not happen except if another action occurs. Note that we do not use 'unless' for impossible conditions.
He won't come
I will be there on time
'If' is used to introduce conditions. It is used in if. It shows that X happens and as a result Y will happen. In other words, Y happens because of X.
I would help
He should have been here
Are They Interchangeable?
No. They are not interchangeable; however, we can use them to express the same meaning.
We will go on a picnic
We won't go on a picnic
You might also like
Even Though vs. In Spite Of
'Even though' and 'in spite of' are synonyms. In this lesson, we will learn when to use each of them and their parts of speech.
Unless vs. As Long As
'Unless' and 'as long as' are used instead of 'if.' In this lesson, we will learn when and how to use them.
Unless vs. Until
'Unless' and 'until' have different meanings but they confuse the learners. In this lesson, we will learn more about them.
Unless vs. Otherwise
'Unless' and 'otherwise' may confuse learners as they are used to express negative meanings. In this lesson, we will learn their difference.
As Long As vs. Until
'As long as' and 'until' are used to express time. In this lesson, we will discover their similarities and differences.