FIRST CONDITIONAL - OPEN CONDITIONS

Ex: If we catch the 10 o´clock train, we shall (can, may, etc...) get there by lunchtime.
      If you wake up before me, give me a call.

In the above sentences, the conditional clauses represent "open" conditions; that is, conditions that may or may not be fulfilled. We make such statements when the action or event mentioned in the conditional clause is being actively considered, or is under discussion or appears likely to happen. Such statements can enen be comments or decisions already taken.

Conditions of this sort are sometimes labelled "probable", but it is important to note that the probability of the condition being fulfilled often exists only in the mind of the speaker. If, for example, it seems likely that someone is going to do something foolish or dangerous, we give a warning: "If you touch that plate, you´ll burn your hand." Only a fool would fulfill the condition in these circumstances.

The commonest sequence of tenses in this type of sentence is:
(If) present tense, (Main) future or modal verb or imperative.

Exercise: write conditional sentences like the ones above, using the given fact, and adding a suitable completion, eg. If he goes to England, he will have to learn English.

It looks as if those shoes in the window are my size.
Don´t drop the vase!
It looks like being fine tomorrow.
My father has suggested that I change my job.
It seems that we´ll be late for the cinema.
Don´t lose my library book!
You may meet some friends of mine in London.
He expects to pass his exam.
They´re hoping it will be a baby boy.
I anticipate getting a rise in salary next year.

Exercise: complete the sentences, following one of the patterns for contditionals of type 1:
We will just manage to catch the train if............................................................................
If I see him again, I .........................................................................................................
I will accept your explanation only if ...............................................................................
If my bank manager will lend me the money, ...................................................................
What will happen if ........................................................................................................
If you don´t hear from me by next Friday, ......................................................................
If your work continues to improve, ................................................................................
................................................................. only if you will promise not to tell anyone else.
Look up the answeer in the key only id...........................................................................
What will he say if .........................................................................................................
If the worst should come to the worst, ...........................................................................
Give me time and ..........................................................................................................

Source: Advanced English Practice - B.D. Graver - Oxford.

Some more examples:
If she can´t come to see us, then we´ll have to go and see her.
If we go by bus, it will be cheaper. (It will be cheaper if we go by bus.)
If you don´t hurry, we will miss the train. (We will miss the train if you don´t hurry.)
If I don´t feel well tomorrow, I will stay home.
If you pass the exam, you will get a certificate.

If you get a high paying job, you won´t have to work as hard.
If you get a high paying job, you´ll be able to travel first class.
If you get a high paying job, you might have to pay higher taxes.
If you get a high paying job, you´ll be able to donate more to charities.
If you get a high paying job, you´ll be able to buy things you want.
If you get a high paying job, you might be on TV or in the newspapers.
If you get a high paying job, people will ask you for a loan.
If you get a high paying job, you will have more free time.
If you get a high paying job, you´ll be able to buy your parents a new car.

If you don´t have to work as hard, you´ll have a lot more free time.
If you eat less sugar, you may feel more relaxed.
If you eat less sugar, you might feel healthier.
If you walk to work everyday, you might feel healthier.
If you walk to work everyday, you may feel more relaxed.
If you wak to work everyday, you´ll stay in shape without joining a gym.
If you don´t get enough sleep, you won´t be able to stay awake in class.
If you own a pet, you may feel more relaxed.
If you don´t get married, you will have more money to spend on yourself.
If you eat less sugar, you´ll lose weight.

If you buy a large dog, you´ll have to take it out for walks everyday.
If you take it out for walks everyday, you might have an accident.
If you have an accident, you may have to go to the hospital.
If you go to the hospital, you won´t be able to take care of your dog,
If you aren´t able to take care of your dog, you´ll probably have to give it away.

If yo fall in love, you´ll feel jealous sometimes.
If you fall in love, you will feel better about yourself.
If you go on a diet, you´ll feel hungry a lot.
If you go on a diet, you´ll have to give up your favourite snack.
If you inherit a lot of money, you´ll be able to buy expensive clothes.
If you inherit a lot of money, you´ll get requests for loans.
If you move to a foreign country, you´ll have to learn a new lnaguage.
If you move to a foreign country, you´ll lose touch with old friends.

Sources> several books.