effort:1.不可数：表示力量和精力.I can carry it without effort.
It's a waste of time and effort.
2.可数：to do sth 努力,奋斗.
Your effort is bound to be successful.
你的努力一定会成功的.
Despite all our efforts we still lost the game.
尽管我们尽了全力,我们还是输掉了比赛.
make an effort to do sth 尽力……
Please make an effort to get there on time.
请尽力按时赶到那里.
The prisoner make no efforts to escape.
那个囚犯没有试图越狱.