用括号中所给单词的适当形式填空
If I ___ (be) there, I ___ (stop) him from doing it then.
___ you ___ (come) here earlier, you ___ (meet) the famous singer in the flesh.
I don’t know the French much. Or I ___ (help) a lot in translating the novel.
If it ___ (rain) tomorrow, the plan for camping ___ (cancel).
If I ___ (learn) harder in the past three years, I ___ (be) in the university now.