effort表示“努力”時，其后可接動詞不定式作其定語，偶爾也可接介詞短語作定語。
make efforts、make an effort、make every effort后面常接動詞不定式，表示“努力做某事”，接an effort時表示“做一番努力”; 接efforts時表示“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.
他全力以赴以按時完成這項工作。
The project has demanded considerable investment of time and effort.
該項目已讓我們投入了相當多的時間和精力。
We need to make a concerted effort to finish on time.
我們需要通力合作才能按時完成。
The local clubs are making every effort to interest more young people.
地方俱樂部正在盡一切努力來吸引更多的年輕人。
She made a visible effort to control her anger.
看得出她竭力控制自己不發火。