The document discusses two types of conditional sentences: Type I conditional sentences use "if + present simple" in the if-clause and "future simple" in the main clause to talk about probable future situations. Type II conditional sentences use "if + past simple" in the if-clause and "conditional (would + infinitive)" in the main clause to give advice or talk about imaginary or improbable situations. Examples are provided to illustrate the structures of each type of conditional sentence.

1. CONDITIONAL SENTENCES
TYPE I AND TYPE II

2. “Okay, see. This year (7th
grade) I found out that I needed glasses to
see better. I almost freaked because most people get their glasses
before they reach the teen age and they all had contacts and stuff. So I
got really vain and I never wore them. I would squint to see the board
or move up.
I´m afraid that if I wear my glasses everyone will think I´m a dork and
no one would like me or something. What should I do? I am so vain
and I wish I could be like those witty little girls who are so joyful all the
time.”
if I wear my glasses everyone will think I’m a dork
condition consequence
If clause main clause

3. CONDITIONAL SENTENCES - TYPE I
 are used to express probable future situations
IF + PRESENT SIMPLE + FUTURE SIMPLE (will + infinitive)
IF CLAUSE MAIN CLAUSE
If Peter doesn’t turn off the music, my headache will get worse.
OR
FUTURE SIMPLE (will + infinitive) + IF + PRESENT SIMPLE
MAIN CLAUSE IF CLAUSE
My headache will get worse if Peter doesn’t turn off the music.

4. A – Complete the sentences, using the correct structure.
1)If you eat too much,...
2)If Sam practises sports,…
3)If she stays out in the rain,…
4)If teenagers go to bed late,…
5)If they eat healthy food,…

5. CONDITIONAL SENTENCES - TYPE II
 are used to:
 give advice
If I were you, I would go to the doctor.
we use were even with the 1st (I) and 3rd persons of the
singular (he, she, it)
OR
 to express imaginary or improbable situations
If she didn’t eat so much, she would be thinner.

6. CONDITIONAL SENTENCES - TYPE II
IF + PAST SIMPLE + CONDITIONAL ( would + infinitive)
IF CLAUSE MAIN CLAUSE
If she didn’t eat so much, she would be thinner.
OR
CONDITIONAL (would + infinitive) + IF + PAST SIMPLE
MAIN CLAUSE IF CLAUSE
She would be thinner if she didn’t eat so much.

7. B – Match the sentences.
1 – He wouldn’t be healthy if her doctor insisted on it.
2 – If I ate too much ice-cream I would stop eating fast
food.
3 – She would go on a diet I would feel sick.
4 – If you gave up smoking if he didn’t exercise.
5 – If I were you you would feel better.

8. CORRECTION:
1 - He wouldn’t be healthy if he didn’t exercise.
2 – If I ate too much ice-cream, I would feel sick.
3 – She would go on a diet if her doctor insisted on it.
4 – If you gave up smoking, you would feel better.
5 – If I were you, I would stop eating fast food.