Upper-intermediate grammar exercise: unless, in case of, in case, as long as

English grammar practice exercise, upper-intermediate.

In this exercise you will practise as long as, in case of, in case and unless.

Exercise instructions

Fill the gap in each sentence with as long as, in case of, in case or unless.

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Grammar explanations

In case
We use in case to express that we are doing something in preparation for something which might happen. Take an umbrella in case it rains!
I'll buy some more wine in case this bottle is not enough.
In case of
We use in case of to say what we should do if or when something happens. In case of fire, leave the building as quickly as possible.
(= ‘If there is a fire, leave the building.’)
As long as

We use as long as to express a condition, i.e. to say that something will happen only on condition that something else happens.

I'll lend you the book as long as you promise to give me it back next week.
(= If you don't promise to give the book back next week, I will not lend you it.)

As long as expresses that one thing depends on another.

You can go to the party as long as you come back before midnight.
(= You can go to the party, but you must promise to be back before midnight.)

As long as has the same meaning as if, providing and provided.

You can go to the party if/providing/provided you come back before midnight.

We're going skiing next week if/providing/provided there's enough snow.


Unless means 'except if'.

We use unless to say that there may be an exception and that this exception will change the situation.

We're playing tennis tomorrow unless it rains.
(= We're playing tennis tomorrow. However, one exception could change our plans – rain.)

Don't go there unless he tells you to.
(= Don't go there, except if he tells you to go.)

We use the present tense after unless when referring to the future.

I won’t go to the party unless she invites me.

unless she will invite

We don't use unless in conditional sentences.

We'll cancel tomorrow's tennis match if it rains.

unless it rains

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