托福寫作句型:假設條件句怎么寫

　　托福寫作句型:假設條件句怎么寫

　　It is essential for young people to have the ability to plan and organize.

　　If a high school student is about to leave school soon, it is necessary for him to have a most suitable plan before the graduation ceremony begins.

　　Teachers should give students homework everyday.

　　If teacher had been checking the students' progress with daily homework assignments, they might not have failed the test.

　　過去的虛擬，把反面的例子變成正面的評論

　　if sb had done, sb might/would have done

　　Traveling alone is better than travelling with a companion.

　　But for the assistance from a companion, travelers would be exposed to more dangers on the way.

　　現在或將來的情況：but for sb/sth, sb would do sth

　　過去的情況： but for sb/sth, sb would have done