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Specifically talking about ば、なら、たら、and と here.

I just read Derek Schaab's excellent reply to [this
question](https://japanese.stackexchange.com/questions/393/differences-
among-%E3%81%9F%E3%82%89-%E3%81%AA%E3%82%89-%E3%82%93%E3%81%A0%E3%81%A3%E3%81%9F%E3%82%89-%E3%81%88%E3%81%B0-etc)
on when to use the different forms of conditionals -- something I'm really
struggling with at the moment. But that is a lot to remember when you're
trying to select the correct expression in a conversation. I expect that most
Japanese aren't even aware of these rules.

So I was wondering, are there simpler rules that get you the right answer most
of the time, and, if you do use the wrong word, how much does it actually
matter? Will you be completely misunderstood, shown to be the foreigner you
are, or anything in between?

Any tips on how other people have approached this learning problem would be
appreciated.
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grammar usage conditionals
How much does it matter if I use the wrong 'if'?
People would figure out what you mean and forgive you because you're only a
learner of Japanese, but you may get a few strange looks for some sentences.

The commenter's research study [in your cited
question](https://japanese.stackexchange.com/a/1784/4223), attributed to a
study done in 1989 by Shinji Sanada also shows

もっと早く｛起きると／起きれば／起きたら｝よかった。 I should have woken up earlier.

  * Tokyo: 4% と; 94% ば; 2% たら 
  * Osaka: 0% と; 20% ば; 78% たら

右に｛行くと／行けば／行ったら｝、ポストが見えます。 If you turn right, you can see a mailbox.

  * Tokyo: 75% と; 16% ば; 8% たら
  * Osaka: 4% と; 13% ば; 83% たら

This shows that in some cases, people will view things differently. But, there
are cases where you'll confuse people by using the wrong one.

If you're using the Tokyo dialect, which I'll assume you are, note that only
2% of people use 〜たら in sentence 1. So it's uncommon. If you do interchange
between them, you can generally get by because the sentence means nearly the
same thing, but the subtle nuances between the options will exist. And yes,
most people in Japan aren't really aware of the rules in my experience.

And there are sentences where you can't substitute them at all. It's worth
using them as "normally" as you can. To do this, all you can do is _hear as
many examples as you can_.

As for how to get used to it yourself, you won't get a sense for it from SE;
try listening to radio, or as most people do with Japanese, watch Anime. Every
time you're on the bus daydreaming, listen to Japanese. Every time you're
washing the car but not doing anything else, listen to Japanese. Every time
you've got an hour to spend during the day, listen to Japanese, even if only
in the background.

This kind of goes with everything linguistic -- the more you use it, the
faster you learn, even intuitively. You don't need to do it as obsessively as
I described, but if you were to do it that obsessively, you'll learn it
faster.
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Edited in bold font

  1. An action **in non-past tense** in a なら clause is to succeed that of the main clause, and if you use it wrongly, people will misunderstand which happens before and which after. **Past tense in なら clauses stands for if it's true or not**.

  2. As long as you use なら correctly, たら is enough versatile to replace ～と and ～ば.

  3. You can't use たら for actions in realized past by the same subject with consistent volitionality. In short, you can say (a) 車に乗ったら 吐いてしまった (When I get on the car, I vomited), but not (b) * 車に乗ったら 運転した (When I get on the car, I drove it). (edit: If you wrongly use it, people misunderstand it's an imaginary conditional or a habitual past.)

  4. (off topic) Use とき for "when".
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After posting this question I found [this link](http://www.learn-japanese-
adventure.com/japanese-conditional-form-to.html). Lessons 24 to 28
systematically introduce the conditionals and the reasons for choosing each
one. Here's my attempt at a summary

**〜と**

Use when the main clause is an inevitable or uncontrollable result of the
condition

> 電気をつけると、明るくなります.
>
> ニューヨークに行くとおもしろい店がたくさんある。

**~ば／なら**

ば is used for verbs and い-adjectives, and なら for (adjectival) nouns (the case
of なら with verbs is covered below). This form allows the main clause to
express commands, requests, volitionality etc.

> 安ければ買います

Grammatically all と sentences can be changed to ば／なら sentences. However, と is
used more for stating facts and ば／なら is used for emphasising the requirement
e.g.

> 暗くなると狼が狩に出かける。

Is a statement of fact (wolves go hunting when it is dark). But in response to
the question 'When do wolves go hunting?' the answer would be better phrased
as

> 暗くなれば狼が狩に出かける。

emphasizing the condition under which wolves go hunting.

These forms have a restriction that they cannot be used if the subject of the
main and conditional clauses is the same when conditional clause is an action.
If this restriction is a problem then you need...

**~たら**

The following sentence cannot use either と or ば／なら.

> お酒を飲んだら、運転してはいけません.

All the forms so far have the restriction that the condition must occur before
the result in the main clause. If you need to lift this condition as well then
you need to use (verb dict-form)+なら e.g

> 明日うちへ来るなら、電話をしてください

I think I'll stop there, because this is starting to become as long and
confusing as anything else I've read. The link has much more detail.
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