Some other uses: ～ば： 1. "If/in case that": in case of common knowledge or some form of condition. a) 春になれば、花が咲く。: If it becomes Spring, the flowers will start to bloom. - It is similar to と. But be wary! While と has a meaning of "when", ～ば is more like "if/in case that". b) ゆっくる話せば分かります。 If you speak slowly, I will understand. - There's the condition. 2. Things that are always the same. - 父は私の顔を見れば「勉強しろ」という。-> My father always tells me "study" when he sees me. 3. ～ばよかった. (A feeling of regret) - あの靴を買えばよかった。-> I should have bought those shoes. ～たら： 1. When A..., ...something B. 日本へ着いたら、すぐに手紙を下さい。-> When you arrive in Japan, write me right away. 2. If condition 今度沢近さんが行ったら、私も行くつもりです。-> If Sawachika-san goes next time, I'm thinking of going also. 3. If I were～ 私が鳥だったら、～ -> If I were a bird, I would～ 4. Recommendations and Advices もっとゆっくり食事をしたら。-> You should eat more slowly.　（that wasn't the literal meaning) Well, those are the general uses, I think.頑張って：Ｄ

Quite an interesting question. First of all, let's translate, shall we? Translation: （１） a. If it isn't possible to finish today, I'll also be troubled. b. If you can't do it today, finish it tomorrow by all means, please. （２） a. If the weather is fine tomorrow, I want to dry the futon, at least. b. If the weather is fine tomorrow, why don't we go for a drive? （３） a. If I had money, I would return my loans. b. If I had money, I would go around the world. A brief explanation: As you can see, all sentences have an "if/in case that" meaning. But, what's the main difference, you ask? 1. When you use ～ば, you can't do it with a noun, or a な-adjective. 2. ～ば is always in present tense, while ～たら isn't bind to that rule. - You wrote the examples yourself. Look at them ^^ 3. In case of ～たら, the first sentence is always before the second. - If I didn't have money, how would I possibly be able to go around the world? 4. Still, do remember that when you use ～ば、you don't have an act of free will. - やればいいんだろう？ -> It's alright as long as I do it, isn't it? (You forced me to do it) 5. With ～ば, there can't be any requests, commands or linear events. 午後になれば、コーヒーを飲みに行きましょう。: That one is WRONG! (There can't be any linear events) I'll write the rest in a separate post, since you can't use more than 2000 characters, it seems.