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FORM Will (deseo)

[will + verb]

Examples:

• You will help him later.
• Will you help him later?
• You will not help him later.

FORM Be Going To(esta planificado)

[am/is/are + going to + verb]

Examples:

• You are going to meet Jane tonight.
• Are you going to meet Jane tonight?
• You are not going to meet Jane tonight.

Examples:

• The year 2222 will be a very interesting year.
• The year 2222 is going to be a very interesting year.

• John Smith will be the next President.
• John Smith is going to be the next President.

• The movie "Zenith" will win several Academy Awards.
• The movie "Zenith" is going to win several Academy Awards

Examples: 

The zero conditional: I take my umbrella if it rains.

The first conditional: I'll call you if I work late.                                 

The second conditional: If the bus didn't arrive on time, I would drive you to the airport.          

The third conditional: She wouldn't have come if I hadn't invited her.

►The zero conditional describes situations that are always true. If has the same meaning as when or whenever.

If I go to school, I get up at seven. (Whenever I go to school I get up at the same time.)

If you park your car on double yellow lines, you pay a fine. (Whenever you park illegally, you pay a fine.)

We use the present simple tense in both the main clauses and the if clauses. 

► The first conditional sentences are used to speculate about possible situations that can really happen at present or in future.

We do not use will in an if clause to describe future activities (compare it to time clauses).

If he studies hard, he'll pass the exams. If we catch the 10.15 train, we will arrive on time. If you don't get the ticket, what will you do?

We make if clauses with if + present tense and main clauses with will + bare infinitive.  

► In the second conditional sentences we speculate about situations that will probably never happen at present or in future.

If I had more time, I would help you. (But I am not free at the moment. I can't help you).

If I won a million dollars, I would start a business of my own. (But I know that it is not realistic.)

We make if clauses with if + past tense and main clauses with would + bare infinitive. 

Note: the verb to be can be specific in the if clause.

If I were rich, I wouldn't work. If he were younger, he would marry her.

(But was is also possible: If I was rich, I wouldn't work. If he was younger, he would marry her.)

But: If I were you, I wouldn't do it. (In this expression, were is much more usual than was.) 

► The third conditional sentences always refer to the past. We speculate about situations that happened or did not happen in the past.

If I had won a million, I would have started a business of my own. (But I didn't win anything.)

If he had met her, he would have told her. (Unfortunately, he didn't meet her.)

If we hadn't practised, we wouldn't have won the match. (But we practised and won.) 

We make if clauses with if + past perfect and main clauses with would + perfect infinitive (have + past participle).