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I have been looking at conjunctive forms of verbs and my grammar books shows
me a negative and affirmative version of ば but what about a past tense and a
past tense negative?

Would they be `じゃなてれば` and `くなかてれば`?
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2012-01-14T05:35:45.380
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conjugations conjunctions
Is there a past tense conjugation form for ば？
Recall that `ば` (-eba) attaches to a verb, and past tense affix turns a verb
into something other than a verb. That means you cannot directly attach `ば` to
past tense. You need to insert `なら` or `ら` in between the past tense and `ば`.
In that case, `ば` can be omitted.

> ...た(な)ら(ば)
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2012-01-14T05:59:40.297
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* the present tense affirmative:

> 「走れば」, 「走るならば」, 「走るのならば」（＝「走るなら」, 「走るのなら」）

  * the present tense negative:

> 「走らなければ」, 「走らないならば」, 「走らないのであれば」 （＝「走らないなら」, 「走らないのなら」）

  * the past tense affirmative:

> 「走ったならば」 （＝「走ったら」, 「走ったなら」, 「走っていたら」）

  * the past tense negative: 

> 「走らなかったならば」, but I think 「走らなかったら」, 「走っていなかったら」 would be more natural.

Oops, I was off the point?
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The past tense is shown by た, and its ば form should be たらば. However, "ば" is
usually omitted in this case, so normally "たら" is used by itself without "ば".

E.g. 雨が降っ **たら** 中止だ。 If it rained the (event) will be cancelled.

The negative for past tense is なかった (E.g. 降ら **なかった** ), formed by ない + た, so
its ば form should follow the rule for た to be なかったら. Again ば is omitted.

E.g. 私が行か **なかったら** 、がっかりしますよね。 If I don't go, (he) would be disappointed.
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