Conditional sentences type I

CONDITIONAL SENTENCESTYPE I

FiRST CONDITIONAL SENTENCES

We use first conditional sentences to express a possible action in the future and its result.

If we go to the cinema, we will eat popcorn.

first conditional sentences Have two CLAUSES: an actioN CLAUSE and a result clause.

ACTION

RESULT

SUBJECT + WILL / WON'T + INFINITIVE ....

IF / UNLESS + SUBJECT + SIMPLE PRESENT ... ,

If you have a temperature,

I will call the doctor.

If you are ill,

you won't go to school.

she won't get better.

If she doesn't take her medicine,

we won't go to the party.

Unless you feel better,

Unless it rains tomorrow,

I will go to the beach.

ACTION

RESULT

IF / UNLESS + SUBJECT + SIMPLE PRESENT .

SUBJECT + WILL / WON'T + INFINITIVE

I will call the doctor

if you have a temperature.

if you are ill.

You won't go to school

She won't get better

if she doesn't take her medicine.

unless you feel better.

We won't go to the party

I will go to the beach

unless it rains tomorrow.

UNLESS

We can use unless (instead of if) to connect the two clauses in a conditional sentence. Unless means if ... not. Therefore unless + an affirmative verb form has the same meaning as if + a negative verb form. We don't use a negative verb form after unless.

She won't feel better unless she takes her medicine. She won't feel better if she doesn't take her medicine.

Both the action clause and the result clause can be affirmative or negative. But only the result clause can be a question.

If I am ill, will you call the doctor? What will he tell his parents if he doesn't pass his exams?

ALTERNATIVES TO WILL / WON'T

When we want to express that the result clause is always or generally true when the action clause happens, we use the present simple in the result clause too. This is called the zero conditional and it is often used to talk about scientific facts.

If you heat water to 100 degrees, it boils. I always walk to the office if the weather is nice.

We can also use the imperative or the modal verbs can, must or should + infinitive in the result clause.

If you have a temperature, stay in bed. If you want to get thinner, you can go on a diet. If she has a problem, she should tell her parents. If people walk in the street, they must wear a face mask.

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