effort表示“努力”时，其后可接动词不定式作其定语，偶尔也可接介词短语作定语。
make efforts、make an effort、make every effort后面常接动词不定式，表示“努力做某事”，接an effort时表示“做一番努力”; 接efforts时表示“作出多次努力”，接every effort表示“每做一次努力”。
例句：
He made a concentrated effort to finish the work on time.
他全力以赴以按时完成这项工作。
The project has demanded considerable investment of time and effort.
该项目已让我们投入了相当多的`时间和精力。
We need to make a concerted effort to finish on time.
我们需要通力合作才能按时完成。
The local clubs are making every effort to interest more young people.
地方俱乐部正在尽一切努力来吸引更多的年轻人。
She made a visible effort to control her anger.
看得出她竭力控制自己不发火。