A first conditional sentence contains two clauses:
the "if" clause and the main clause.
To make the "if" clause, we use:
"if" + present tense.
To make the main clause, we use:
The "if" clause can be used first or second. The meaning is exactly the same:
- If they are late, we will leave without them.
- We will leave without them if they are late.
When the "if" clause is used first there is a comma between the clauses.
We can use "when" in place of "if":
- "if" implies possibility
- "when" implies that it is certain.
- If I get home late, we won’t have dinner.
- When I get home, we’ll have dinner.
Complete the sentences with the correct form of the verb in brackets.
Complete the sentences with the correct answer from a, b, c or d:
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Intermediate level language point
We can use "unless" in place of "if".
"Unless" means "except if" or "if + not".
- "You won't be promoted unless you complete the project on time."
- "Unless you pay the fine, the police will take your car."
The following two sentences have the same meaning:
- "If you don't read the book, you can't review it."
- "Unless you read the book, you can't review it."