高中英语语法if条件句If_Clauses

If you played a musical instrument, you could join the local bend.
If she tried Japanese food, she might find that she likes it.
If I should win the race, I should thank the coach for his help.
Go/You can go to bed if you feel tired.
TYPE ONE
In the first conditional, we describe a real possibility. We talk about facts that, given certain conditions, probably or possibly will take place in the future.
• The second conditional is also used when propose a different situation to the present reality.
If you worked harder, your grades would be much better. (situation that is different to
If you spend too much time in the sun, you may get sunburnt. (it isn’t certain)
TYPE TWO
• When we assume a condition to be improbable or imaginary and that we don’t expect to happen but is however, theoretically possible, we can use the second conditional.
If you would kindly tell the manager, I would really be grateful.
• The use of should in if clauses makes the hypothesis more impropable.
If it should hail, the harvesonger if you travel north. If you press this key, the display lights up.
• give advice. In this case, the present form of imperative or modal (can or may) is used in the main clause
If you had asked me, I would have helped you. If I had found her address, I would have sent her an invitation.
(Sometime in the past, I wanted to send an invitation to a friend. I didn't find her address, however. So in the end I didn't send her an invitation.)
He would make a very good career if he was/were a little more ambitious.
• The expressions If i were you/him/her.... is used to give advice and warnings.
The modals would, should or could are often found in if clauses.
• Would is used in if clauses to express a request in a polite and formal way, or even to express willingness to do something.
Main clause: would/’d/wouldn’t + base form I would drive to work. I would send her an invitation. I wouldn’t stay here.
• Note how the second conditional is structured in the question form:
In this case, the verb tenses are usually: If clause: if + present simple If it doesn’t rain, If I find her address, Main clause: will/’ll/won’t + base form we’ll have a barbecue in the garden tomorrow. I will send her an invitation.
the present reality: at the moment you aren’t working hard enough)
The structure of the second conditional is:
If clause: if + past simple If I had my own car, If I found her address, If I had a lot of money,
If clause (condition)
If you book your holiday in advance,
Main clause (consequence)
you get a discount.
Depending on the level of probability (certain, probable, possible or purely theoretical conditions) different tenses are used in two parts of the conditional. There are four types of conditional: type zero, one, two and three, which we are going to explain.
If clause: if + present simple
If you visit London,
Main clause: present simple
go on the London Eye.
The zero conditional is used to:
• express general truths, scientific and mathematical laws, technical procedures, instructions.
IF Clauses
To express a consequence depending on a condition, we use the conditional, which consists of an IF clause. The IF clause can precede or follow the main clause. When the IF clause comes first, a comma is placed between the two clauses.
If I were you, I’d talk to her.
In a main clauses, as an alternative to would, other modals can be found such as: could to express ability or possibility, might to express uncertainty and should to express a piece of advice.
• The use of could in if clauses indicates the ability and possibility.
If you could dance, you would have a lot more fun.
TYPE THREE
When we propose an impossible condition, because it refers to the past and it is therefore no longer possible, we use the third conditional.
TYPE ZERO
In the IF clause of the zero conditional, we describe a consequence that takes place regularly and with certainty. If clause: if + present simple If I drink coffee in the evening, If clause: if + present simple If unemployment is rising, Main clause: present simple I can’t go the sleep. Main clause: present simple people tend to stay in their present jobs.
If you come to my house, I’ll show you my paintings.