In Chinese actually we don‘t have ’times‘，if you want to say ’I ate a pizza yesterday‘= 昨天我吃了一个pizza. It means that you only have to add the time it happened, no matter it happened yesterday, last week, or in the future. This part of chinese is very easy, you don‘t have to think about changing anything，you just add the time，that’s it！ Another situation is that if you can't remember when it happens clearly, you add'了'or ‘过’after the verb. For example: 我看过《Avatar》我看了《Avatar》= I've watched 《Avatar》before. 我吃过饭了=我吃饭了=I've had my meal. But when you want to express the future and not sure when, you can use '要' or ‘将要’before the verb：for example 我要去超市买牛奶=I 'm going to the supermarket to buy milk.

Hi, Actually we use “很久以前” more frequent, whenever you want to express a long time ago( I think at least more than 10 years) you can use it. As for "很早以前"，usually there are sentences before and after it. For example" 其实那件事是很早以前发生的=actually it hap pened a long time ago “很早已经” in Chinese it's not a fixed sentence. we don‘t put 很早and 已经together（of course in a long sentence they can coexist but not “together”） 早 in Chinese usually means ’early‘。 久 in Chinese means a long period of time and ancient as well both two words might have same meaning if they are added with other words：很早以前=很久以前（it depends on the meaning of the sentence） a little tips：in Chinese there are a lot of situations that can't be understand，compared to many other languages Chinese tends to have less ’logical regulations‘，so just remember them in heart and don't spend too much time on “ why”（even Chinese don’t know why，hahaha）