1.

   (1) S + may (或might) well + V…
   (2) S + may (或might) as well + V…
   (3) S + may (或might) as well A as B
   例句：
   (1)   He may well be proud of his son.
   (2)   You may as well not lend your money to him.
   (3)   You might as well reason with the wolf as try to persuade that man.

   2.

   (1) may (或might) + 原形V
   (2) may (或might) + have + p.p.
   例句：
   (1)   He may come, or may not.
   (2)   Rambo may have gotten lost.

    3.

   S + would rather + V1 + than + V2…
   = S + would + V1 + rather than + V2…
   = S + would sooner + V1 + than + V2…
   = S + prefer to + V1 + rather than + V2…
   = S + prefer + Ving1 + to Ving2
   例句：
   He would rather die than yield
   = He would die rather than yield.
   = He would sooner die than yield.
   = He preferred to die rather than yield.
   = He preferred dying to yielding.

    4.

   S + can’t… too…
   = It be impossible… sufficiently…
   = S + can + hardly… enough
   例句：
   I can not praise her too much.
   = It is impossible for me to praise her sufficiently.

    5.

   S + do + V…
   例句：
   I do believe in him.