IF

If envy were a fever all minkind would be ill.
If I were to compare it to driving, you would think this would be like driving a truck or a bus. It's like driving a Ferrari.”
If I were to compare the Olympic decathlon to fatherhood, I would say fatherhood is a lot tougher.
If you were to ask everyone what 'Hamlet' was about, they might say, "It's about a prince, and he says, 'To be or not to be.'
(You know), if it weren't for these fans, I wouldn't have gotten as far as I did.

If life's lessons could be reduced to single sentences, there would be no need for fiction.

If today were the last day of your life, would you want to do what you are about to do today?

if it weren't for somebody/something

The situation would have been different without someone or something If it weren't for him, I would probably be living on the streets.  * I'd keep a garden if it weren't for having too much to do.

Usage notes: also used in the form if it hadn't been for someone or something:

* If it hadn't been for Judy, Betsy was sure she would have left the city.

 
* If it wasn't for the nights (Abba's song)
  
* My life would have gone along perfectly well, politically speaking, if it hadn't been for girls.

 * If it hadn't been for the Cold War, neither Russia nor America would have been sending people into space."

* If you think nobody cares if you’re alive, try missing a couple of payments.

* If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals.

If you want to learn, then teach. Cicero

If you want others to be happy, practice compassion. 

If I agreed with you we’d both be wrong.

I think I would go further into fine arts, I think, if I were to continue. 
If I couldn't laugh, I'd rather die.

If it's a good song, it doesn't really matter if it's trendy or not. It will hit.

If it is important to you, you will find a way. If not, you'll find an excuse.

If it was up to me, everyone caught with a knife would get an automatic ten year sentence. * There was a theft! But, of course, if it was up to me, every two years I would win an Oscar. * If it was up to me, there wouldn't be no such thing as the establishment. (often capitalized,social, political order), la clase dirigente.

Life would be tragic if it weren't funny. Stephen Hawking

(Do you realize) if it weren't for Edison we'd be watching TV by candlelight? *If it weren't for the Beatles, I would not be a musician. * If it weren't for baseball, many kids wouldn't know what a millionaire looked like.

If it wasn't hard, everyone would do it. It's the hard that
makes it great.

If the facts don't fit the theory, change the facts.

If there is a State, then there is domination, and in turn, there is slavery.

If you're going through hell, keep going.

If you're not making mistakes, then you're not doing anything.

If you’re not making mistakes, you’re not taking enough risk.

If you're not married, chances are you think a lot about you.

If you aren't happy in one place, chances are you won't be happy anyplace.

If you can dream it, you can do it. Walt Disney

If you don't have enough time, stop watching TV.

If you find yourself caring for a relative with dementia, the chances are you'll need help. (It is likely)

SPECIAL CASES

If you want a thing done well, do it yourself.

 

If you want something go get it. Period.

If you want others to be happy, practice compassion.

If you want to know what a man's like, take a good look at 

how he treats his inferiors, not his equals.

If you put on weight it's not by chance. You put on weight

because you eat compulsively.

If we knew ourselves perfectly, we should die. 

Re: Subjunctive vs conditional    

This is a fairly complex topic and even the experts disagree on the nuances. The web has vast amounts of information on the formation and use of the conditional/subjunctive, the decline of the subjunctive in English, and provides many examples.

The conditional mood involves statements in which the results or outcome are contingent (depend) on a given situation or condition, including, like the subjunctive, hypothetical situations. The certainty of the outcome can vary from absolutely certain (not always considered the "true" conditional) through generally, potentially, and rarely certain to contrary to fact (the unreal conditional). For example:

If you take LSD you start to hallucinate. (Certain)
When I feed my dog, he usually bites me. (Generally certain)
If he were to arrive right now, we might have a chance to see him. (Hypothetical/uncertain).
If I made lots of money, I would invest in gold (Contrary to fact).

The subjunctive mood treats statements of emotion, wishing, uncertainty, and contrary to fact/hypothetical situations:

I wish he were dead!
May you always be prosperous!
I wish I were in Figi, it is too cold here.
Would that it were true / so! (*)
(*) The expression would that it were implies a wishful or idealized alternative to an undesired reality. In other words, the speaker wishes for a different set of circumstances or outcome than the real situation he or she is in.

There is a link between the conditional and subjunctive: in an unreal present conditional statement (one hypothetical or contrary to fact), the main clause (the result) is in the conditional while the subordinate clause (the condition) is in the subjunctive:

I would have more fun in Berlin if I spoke German. (I don't speak German).

THE SUBJUNCTIVE MOOD

A verb is in the subjunctive mood when it expresses a condition which is doubtful or not factual. It is most often found in a clause beginning with the word if. It is also found in clauses following a verb that expresses a doubt, a wish, regret, request, demand, or proposal.
These are verbs typically followed by clauses that take the subjunctive:

ask, demand, determine, insist, move, order, pray, prefer, recommend, regret, request, require, suggest, and wish.

In English there is no difference between the subjunctive and normal, or indicative, form of the verb except for the present tense third person singular and for the verb to be. The subjunctive for the present tense third person singular drops the -s or -es so that it looks and sounds like the present tense for everything else. The subjunctive mood of the verb to be is be in the present tense and were in the past tense, regardless of what the subject is.

Incorrect: If I was you, I would run.  Correct: If I were you, I would run.

(The verb follows if and expresses a non-factual condition.)  

Incorrect: I wish he was able to type faster. Correct: I wish he were able to type faster.
(The second verb is in a clause following a verb expressing a wish. It also suggests a non-factual or doubtful condition.)  

Incorrect: His requirement is that everyone is computer literate. Correct: His requirement is that everyone be computer literate.
(Subordinate clause follows main clause with a demand.)  

Incorrect: He recommended that each driver reports his tips. Correct: He recommended that each driver report his tips.

Sometimes we may use the conditional auxiliary verbs of could, should, or would to express the same sense.

Subjunctive:I wish he were kinder to me. 

Conditional: I wish he would be kinder to me.

Note: In modern English, the subjunctive is found only in subordinate clauses.

Study as if you were going to live forever; live as if you were going to die tomorrow