if + condition, resultUse if for a straightforward possible condition and result.
Condition Linkers Overview
B1Use if for a basic condition, unless for if not, provided that and as long as for required conditions, and otherwise for the result if the condition fails.
What you'll learn
- Choose if for a normal possible condition.
- Use unless to mean if not without adding another not.
- Use provided that for a strong required condition.
- Use as long as when permission depends on a condition being respected.
- Use otherwise to give the consequence if not.
- Match each linker to the exact condition meaning.
Structure
unless + positive clause, resultUnless already means if not, so do not add not inside the unless-clause.
result + provided that + conditionUse provided that when the condition is strict, required, or formal.
result + as long as + conditionUse as long as when permission or truth continues only under that condition.
instruction or condition. Otherwise, consequence.Otherwise introduces the bad or unwanted result if the first condition is not met.
Build a sentence
Linker
Meaning
ifbasic condition
If Anna arrives early, we’ll start at six.
Use if for a normal possible condition.
When to use
Simple possible result
Use if when the speaker presents a normal condition and result. If Anna finishes early, she’ll join us for dinner.
Negative condition
Use unless when the result happens except in one case. Unless Maria texts us, we’ll start without her.
Strict requirement
Use provided that in formal or strict situations. You can borrow the car provided that you bring it back by nine.
Limited permission
Use as long as when something is okay only under a condition. Tom can stay in the office as long as he keeps the door open.
Warning or consequence
Use otherwise to show what happens if the advice is ignored. Leave now. Otherwise, you’ll miss the last train.
Markers
ifunlessprovided thatas long asotherwise
Common mistakes
Wrong
Unless Lisa doesn’t hurry, she’ll miss the bus.
Correct
Unless Lisa hurries, she’ll miss the bus.
Unless already means if not, so don’t add another negative inside the clause.
Wrong
Provided that Sam is tired, he’ll go home early.
Correct
If Sam is tired, he’ll go home early.
This is a normal possible condition, not a strict requirement, so if is the natural linker.
Wrong
You may enter if you show your pass at the door.
Correct
You may enter provided that you show your pass at the door.
The meaning is permission under a strict rule, so provided that fits better than basic if.
Wrong
You can use my laptop as long as you are careful. = You can use it for many hours.
Correct
You can use my laptop as long as you are careful. = You can use it only if you are careful.
Here as long as gives a condition for permission, not a long period of time.
Wrong
Take an umbrella, otherwise if it rains.
Correct
Take an umbrella. Otherwise, you’ll get wet.
Otherwise must introduce the consequence if the advice is not followed.
Wrong
Unless you send the photo today, you can join the ad.
Correct
Provided that you send the photo today, you can join the ad.
Unless blocks the result except in one case. The sentence needs a required condition, so provided that is the right choice.
Common misconceptions
❝ Unless needs not after it because it is a negative idea. ❞
Unless already contains the negative meaning. Use a positive verb form after unless: Unless he calls, we’ll leave.
❝ If, unless, provided that, and as long as all mean the same thing, so I can swap them freely. ❞
They all connect conditions, but each one adds different logic: simple condition, negative condition, strict requirement, or limited permission.
Skills in this rule (6)
IF_FOR_POSSIBLE_RESULTw5Use if to introduce a possible condition
Use if when one action or result depends on another possible situation. The if-clause gives the condition; the main clause gives the result.
UNLESS_FOR_NEGATIVE_CONDITIONw5Use unless to mean if not
Use unless for one negative condition. It means if not, so the clause after unless stays positive in form.
PROVIDED_THAT_FOR_STRONG_CONDITIONw4Use provided that for a strong required condition
Use provided that when the condition is strict or official. It often appears in rules, offers, and permissions.
AS_LONG_AS_FOR_REQUIRED_LIMITw4Use as long as for a condition that must continue or be respected
Use as long as when something is allowed or true only while a condition is met. It often sounds practical and ongoing.
OTHERWISE_FOR_RESULT_IF_NOTw5Use otherwise to show the result if the condition is not met
Use otherwise after an instruction, warning, or condition. It means if not and introduces a consequence.
MATCH_LINKER_TO_MEANINGw5Choose the linker that matches the exact meaning
Pick if, unless, provided that, as long as, or otherwise based on the message: simple condition, negative condition, strict requirement, continuing limit, or consequence if not.