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Grammar reference

Conditionals

Unless, Provided That, As Long As

Ways to state conditions without using if.

b2

Explanation

Unless means if not, so it takes a positive verb. Provided that and as long as stress that the condition is a requirement. In case warns about a precaution and does not mean if.

Examples

  • Unless you book early, the seats go quickly.
  • You may borrow it as long as you return it Friday.
  • Take an umbrella in case it rains.

Common mistakes

  • Unless you do not book early, seats go.

    Unless you book early, the seats go quickly.

    Unless already contains the negative.

  • As long as you will return it.

    As long as you return it.

    No will after the conjunction.

  • I will take an umbrella in case if it rains.

    I will take an umbrella in case it rains.

    In case takes no if.

More Conditionals

Mixed Conditionals

Past condition with a present result, or the reverse.

Wish and If Only

Expressing regrets and desires.

Conditionals: Zero, First, Second, Third

Four patterns for real and unreal conditions.