You can do either. Past tense is more popular, although some well known books such as The Hunger Games and Monsters of Men have used present tense. When present tense is used though, the books are usually written in first person aswell.
Past tense I had Present tense I have Future Tense I will have
Have is present tense. The past tense is had.
No 'is' is present tense. am/is/are = present tense was/were = past tense
Present - am. Past - was and were.
Creep is present tense. The past tense is crept.
"Has" is the present tense form of the verb "have." The past tense form of "has" is "had."
Present tense - clean. Past tense - cleaned. Present tense - work. Past tense - worked. Present tense - play. Past tense - played.
Go is present tense. The past tense is went.
Should is present tense.
"is' is present tense. For past tense use was or were.
It's the present tense.
Lead is present tense. The present participle is leading. Led is the past tense and past participle.