爱华网如： It’s a waste of time and effort. 那是浪费时间和精力。
His success depends upon effort and ability. 他是否成功取决于他的努力和能力。 Thisrequires tremendous effort on the part of its people.这要求它的人民做出巨大的努力。
若强调一次一次具体的努力(尝试），通常是可数名词，尤其与all, these等修饰语连用。
如： All his efforts were of no avail. 他的努力都没有用。
With a great effort he jumped on. 他费劲跳了上来。
In spite of his efforts he failed.他虽然做了努力，还是失败了。
His efforts this term have been most creditable.他这学期的努力值得赞许。
But all these efforts ended in failure. 但所有这些努力都以失败而告终了。
Faced with such an arduous work, we must redouble our efforts.面对这样艰巨的任务，我们必须加倍努力
effort用法注意2其后接动词，通常用不定式，有时也用“at＋动名词”。
如： He made every effort to get [at getting] it. 他竭尽全力想得到它。
effort用法注意3表示“作出努力”，通常 make an effort 这样的形式，该结构中的不定冠词(an)也可根据情况换成 another,every, one more, no 等限定词，但不能没有限定词。
如： He decided to make one more effort. 他决定再作一次努力。
Every effort was made, but to no avail.做了一切努力，但没有用。
She made every effort to be a good student.她努力要做个好学生。
The team made a concerted effort to win the game.队员们同心协力来打赢这场球。 【注】若没有限定词，effort 就应用复数。如The prisoner made efforts toescape, but he failed. 那个犯人企图越狱，但没有成功。
