The phrase 'have put much effort' is correct and usable in written English.
It is typically used after discussing a specific task, to suggest that a lot of effort was put into it. For example, "We have put much effort into preparing for today's meeting."
In truth, local governments have put much effort into maintaining this natural monopoly.
They understand that it does America no good to appear indifferent to international laws, and have put much effort into softening the cavalier language and policy that have come from the White House and the Pentagon.
"Fulham have put much effort into Lewis.
Health professionals have put much effort into supporting women to continue breastfeeding up to six months and beyond.
Interactionism and ethnomethodology have put much effort into revealing the gender display and doing gender that people engage in on a daily basis without any realization.
Even in cases like legal reasoning, where logicians and logically-minded legal theorists have put much effort into formalizing the reasoning, the utility of the results is controversial.
America's Department of Commerce has put much effort in recent years into improving the quality of its trade numbers.
Mallon goes on to quote Guterson's tribute to a student ("a brilliant watercolorist") who received, to her anguish, a C for an essay on Kipling into which she had put much effort.
That makes David Cameron look a little lonelier, and as someone who has put much effort into presenting himself as an affable centrist even more important to his government, and to its claims to be ruling in the national interest.The consequences of today's student anger may go further still.
European Commission has put much effort and funds to European projects connected with education of future managers.
While no previous trade commissioner has put much effort into this aspect of the post, there is considerable potential for a commissioner to mobilize sympathetic business constituencies via the media.
