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[١٤/‏٤ ١٠:٥٤ م] NobleMan: These are some points about Conditionals and a brief summary of the first conditional:
Conditionals: if
from English Grammar Today

Imagined conditions

There are different types of conditions. Some are possible or likely, others are unlikely, and others are impossible:

If the weather improves, we’ll go for a walk. (It is possible or likely that the weather will improve.)

If the weather improved, we could go for a walk. (It is not likely that the weather will improve.)

If the weather had improved, we could have gone for a walk. (The weather did not improve – fine weather is therefore an impossible condition.)

These types of conditions are used in three types of sentences, called first, second and third conditional sentences.

Imagined conditions: the first conditional

We use the first conditional to talk about the result of an imagined future situation, when we believe the imagined situation is quite likely:

[imagined future situation]
If the taxi doesn’t come soon
,
[future result]
I’ll drive you myself
.

First conditional: form

conditional clause
main clause
if + present simple
modal verb with future meaning (shall/should/will/would/can/could/may/might)
If he gets a job in Liverpool,
he’ll have to get up early. It’s a long drive.
If Sheila rings,
I might ask her to come over for dinner.
Warning:
We use the modal verb in the main clause, not in the conditional clause.

If a lawyer reads the document, we will see if we’ve missed anything important.

Not: If a lawyer will read the document…
[١٤/‏٤ ١٠:٥٤ م] NobleMan: And here's the link below
http://dictionary.cambridge.org/grammar/british-grammar/conditionals-and-wishes/conditionals-if