① I study English every day.
② I studied English yesterday.（last night）
③ I am going (will) to study English tomorrow.（next Monday）
④ I am studying English now.
⑤ I was studying English two hours ago.（then）
⑥ I am going (will) to be studying English at nine tomorrow.
⑦ I have studied English for a year.
We have been good friends since then.
⑧ I had studied English when my mother came home.
⑨ I will have finished the book by next week.
I will have lived in Sapporo for five years next month.
⑩ I have been studying English since 7 p.m.（this morning）
⑪ I had been studying English for two hours when my mother came home.
⑪ I will have been waiting here for three hours by six o'clock.
☆仮定法（・妄想、願望 ・助動詞の過去 ・wasでなくwere ・wish, if）
① I wish I could fly.
I wish I were a cat.
② If I were you, I would go to bed.
If it were sunny today, I would go swimming.
If I were eighty years old, I wouldn’t go there.