Exercise 3

Fill in the gaps with the verbs in brackets in the correct tense.

Hi brother,

We're at the station, but our train isn't here yet. We're worried because if the train 1 (not arrive) on time, we 2 (miss) our flight, and we 3  (have to) spend the night here. When we 4  (get) to the airport, I 5  (text) you. We are very excited about the holiday. Sandy is looking forward to taking surfing lessons. She says as soon as we 6  (check in) at the hotel, she 7  (look for) a surf instructor. However, she says she won't take any lessons if I 8  (not surf) with her. We expect the weather will be fine. If it 9  (not be), we 10  (be) very upset. We are also planning to try the local food. If the hotel restaurant 11  (be) nice, we 12  (have) a meal there as soon as we 13  (check in). One more thing, 14  (you/ water) the plants if I 15  (promise) to take you out for dinner when we come back?

Take care,



First conditional – grammar chart

First conditional B1

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if clause and main clause

All conditional sentences have two parts: the if clause and the main clause. It doesn’t matter which clause comes first, but when the if clause comes first, we should put a comma after it.

  • If it rains, we’ll stay home
  • We’ll stay home if it rains.


if + present, future

In the first conditional, the verb in the if clause is present and the verb in the main clause is future (will).

  • If you don’t go to sleep, you’ll be very tired tomorrow.

The if clause may have a present or a future meaning, but the verb is always in present (NOT future)

  • If you are a good boy tomorrow, mummy will buy you a present. (NOT If you will be a good boy)


Main clause: will, modal verb, imperative

In the main clause, we can use may, might, can, must, should instead of will.

  • If he doesn’t train harder, he may/might lose the championship.
  • If your room is tidy, you can leave.
  • If you want to lose weight, you must/should eat less sugary things.

Or we can also use an imperative instead of will.

  • If you arrive after midnight, ring me on my mobile.


unless = if (not)

We can also use unless in conditional sentences to mean if … (not)

  • I won’t go on holiday unless I save some money.
  • = I won’t go on holiday if I don’t save some money.


Future time clauses – grammar chart

Future time clauses B1

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when, as soon as, before, after, until

When we use a verb after when, as soon as, before, afteror until to talk about the future, we have to use this verb in present tense (NOT future). We use the future in the other part of the sentence.

  • I’ll retire when Im 70. (NOT: when I’ll be)
  • I won’t call you until I arrive. (NOT: until I will arrive.)


Similar to first conditional

Future time clauses are similar to the first conditional. There’s a main clause and a when/after/etc. clause. We use the verbs in these clauses like in the first conditional.

We use a comma when the when/after/etc. clause is at the beginning of the sentence. But we don’t use a comma if the when/after… clause is at the end of the sentence.

  • I’ll retire when I’m 70. 
  • When I’m 70, I’ll retire

We use present in the when/after/etc. clause and we use future in the main clause.

  • Before you go to sleep, daddy will tell you a story. 

In the main clause, we can also use may, might, can, must, should or an imperative instead of will.

  • As soon as you finish, you can leave. 
  • After you arrive, call me.