Answer:
1. I worked hard so that I could pass.
2. How long you stood here?
Explanation:
Worked is used here, and is the past-tense verb for work. Generally, past-tense verbs refer to actions or events in the past. In the sentence, the person is referring to how they worked hard so that they could pass. Keep in mind that there are also other words that give hints to show what verb tense you should use, such as the word "could". Could is also past of can, which implies that this has happened not in the future, not in the present, but in the past..
Stood is used here because once again, it is the past-tense verb for stand. Again, if you use context clues and dig deeper into the text, you can see that whoever asked this question, is asking how long you stood here? They were not asking that question in the future, nor in the present time, so just be aware to use context clues to figure out the tenses of the verbs.
