Hi! :) Studying tenses has brought up some new questions. I've tried to explain my thoughts as far as possible so you can provide me with the rules I'm missing. Because I'd like to know *why* the sentences I wrote below are used this way (I just don't like to "know" grammar rules only by ear …) 1. I'm happy when my cast is removed. (= I'm looking forward to THAT day, not talking about getting a cast removed in general.) Present simple??? I don't know any grammar rules that could come into use here but it sounds good to me. But I think writing it in the present simple tense could mean "in general"? E.g. I've broken my leg many times and I'm always happy when my cast is removed. 2. You didn't do anything wrong. Sounds most natural to me but I haven't got the faintest why the past simple is actually used here? Do I also use the simple past tense when it's still important at the moment of speaking? Or would the present perfect be more appropriate (E.g. I'm not mad at you, you haven't done anything wrong.)? 3. She has lost the necklace that I gave her. I'd have written it like this, too, but I was wondering why it's not "had given" (to make the order of events clear)? Because it'd also be "Yesterday, she lost the necklace I had given her" or am I mistaken? 4. I found that book you had sent last summer interesting. Could "I've found" also be used in this context? "Had sent" or just "sent"? I think it's the same (or a similar) confusing question as in the sentence above. 5. I was tired, so I didn't go to the party. Does it make sense to use the past perfect here? Because it led to a result (+ order of events), doesn't it? E.g. I had been tired, so I didn't go to the party. (It sounds so wrong to me.) 6. They had started eating before we arrived yesterday. Can I use a finished time word with the past perfect (because I know that I can absolutely not use it with the present perfect)? Same uncertainty with the 4th sentence. Or does "yesterday" belong to "we arrive …"?