make effort to/ make efforts to 哪个对?

make effort to/ make efforts to 哪个对? make efforts to do sth.为什么effort要加s? make efforts/an effort to do和in a common effort make all effort 还是efforts? make efforts to怎么用 英语翻译大力增加森林碳汇 make vigorous effort?efforts?to increase forest make efforts to do sth.为什么effort要加s,它是可数名词吗? effort的用法?是什么时候单数 什么时候复数?make great efforts to do 还是effrot? make one's effort to make persistant efforts to reach the Make every effort to do everything make efforts与make an effort的区别是什么