First Conditional: unless / as long as / provided that (B1)

Your task

Fill in the gap in each sentence with the correct word or phrase.

0 / 15 answered

Your score

0 / 150%

Keep practising! Focus on the explanations below.

you leave now, you will miss the last train.

Correct answer: Unless

"Unless" means "if not" — the sentence means "If you don't leave now, you will miss the train." It introduces the negative condition.

You can go to the concert long as you finish your homework first.

Correct answer: as

"As long as" is the connector meaning "on the condition that". "As long" alone (without "as") is incomplete.

You will get the discount that you spend over £50.

Correct answer: provided

"Provided that" = "as long as" in a slightly more formal register. "Provided" alone (without "that") is also acceptable.

he apologises, she won't speak to him again.

Correct answer: Unless

"Unless he apologises" = "If he doesn't apologise". Present simple after "unless" — no "will" in the unless-clause.

You can borrow my car as long you fill it up with petrol afterwards.

Correct answer: as

"As" completes "as long as". The structure "as long as + present simple" expresses the condition for permission.

The bank will lend you the money on that you repay it within two years.

Correct answer: condition

"Condition" completes "on condition that" — a formal synonym of "provided that". Present simple follows the connector, not will.

the doctor tells you to stop, continue taking the full course of antibiotics.

Correct answer: Unless

"Unless the doctor tells you to stop" = "If the doctor doesn't tell you to stop". The unless-clause uses present simple, not future.

The agreement will be valid both parties sign it before Friday.

Correct answer: provided

"Provided" (or "provided that") introduces the formal condition. "Providing" is also acceptable in informal use.

I'll help you with the project I have time this weekend.

Correct answer: as long as

"As long as" (positive condition) is the connector — "I'll help you on the condition that I have time." "Unless" would mean "if I don't have time", reversing the meaning.

you confirm your booking in 24 hours, the reservation will be cancelled.

Correct answer: Unless

"Unless you confirm" = "If you don't confirm". The result is negative (cancellation), so the condition with "unless" is the positive action that prevents it.

The company will release the funds that all documents are submitted correctly.

Correct answer: provided

"Provided that" is the formal contract connector. "As long as" also works. After either connector, use present simple — not "will be submitted".

The manager will approve the request as long as the cost within budget.

Correct answer: stays

"Stays" (present simple third-person singular) follows "as long as". "Will stay" cannot follow a conditional connector in the condition clause.

She won't improve she practises more.

Correct answer: unless

"Unless she practises more" = "If she doesn't practise more, she won't improve". "Unless" is followed by a positive verb form — not "unless she doesn't practise".

I will lend you the money condition that you pay me back by Friday.

Correct answer: condition

"On condition that" is the formal equivalent of "provided that / as long as". The blank takes "condition" — preceded by "on" and followed by "that".

You can stay in the apartment you respect the house rules.

Correct answer: as long as

"As long as" or "provided (that)" express positive conditions for staying. "Unless you respect" would mean "if you don't respect", which changes permission to prohibition.

Please answer at least one question first.

Found an error in this exercise? Let us know.

Your task

Fill in the gap in each sentence with the correct word or phrase.

0 / 15 answered

Your score

0 / 150%

Keep practising! Focus on the explanations below.

you leave now, you will miss the last train.

Correct answer: Unless

"Unless" means "if not" — the sentence means "If you don't leave now, you will miss the train." It introduces the negative condition.

You can go to the concert long as you finish your homework first.

Correct answer: as

"As long as" is the connector meaning "on the condition that". "As long" alone (without "as") is incomplete.

You will get the discount that you spend over £50.

Correct answer: provided

"Provided that" = "as long as" in a slightly more formal register. "Provided" alone (without "that") is also acceptable.

he apologises, she won't speak to him again.

Correct answer: Unless

"Unless he apologises" = "If he doesn't apologise". Present simple after "unless" — no "will" in the unless-clause.

You can borrow my car as long you fill it up with petrol afterwards.

Correct answer: as

"As" completes "as long as". The structure "as long as + present simple" expresses the condition for permission.

The bank will lend you the money on that you repay it within two years.

Correct answer: condition

"Condition" completes "on condition that" — a formal synonym of "provided that". Present simple follows the connector, not will.

the doctor tells you to stop, continue taking the full course of antibiotics.

Correct answer: Unless

"Unless the doctor tells you to stop" = "If the doctor doesn't tell you to stop". The unless-clause uses present simple, not future.

The agreement will be valid both parties sign it before Friday.

Correct answer: provided

"Provided" (or "provided that") introduces the formal condition. "Providing" is also acceptable in informal use.

I'll help you with the project I have time this weekend.

Correct answer: as long as

"As long as" (positive condition) is the connector — "I'll help you on the condition that I have time." "Unless" would mean "if I don't have time", reversing the meaning.

you confirm your booking in 24 hours, the reservation will be cancelled.

Correct answer: Unless

"Unless you confirm" = "If you don't confirm". The result is negative (cancellation), so the condition with "unless" is the positive action that prevents it.

The company will release the funds that all documents are submitted correctly.

Correct answer: provided

"Provided that" is the formal contract connector. "As long as" also works. After either connector, use present simple — not "will be submitted".

The manager will approve the request as long as the cost within budget.

Correct answer: stays

"Stays" (present simple third-person singular) follows "as long as". "Will stay" cannot follow a conditional connector in the condition clause.

She won't improve she practises more.

Correct answer: unless

"Unless she practises more" = "If she doesn't practise more, she won't improve". "Unless" is followed by a positive verb form — not "unless she doesn't practise".

I will lend you the money condition that you pay me back by Friday.

Correct answer: condition

"On condition that" is the formal equivalent of "provided that / as long as". The blank takes "condition" — preceded by "on" and followed by "that".

You can stay in the apartment you respect the house rules.

Correct answer: as long as

"As long as" or "provided (that)" express positive conditions for staying. "Unless you respect" would mean "if you don't respect", which changes permission to prohibition.

Please answer at least one question first.

Found an error in this exercise? Let us know.