a great deal of work / worked a great deal

[Why?Why?Why?]

Hello everybody!
If I want to say " He trabajado mucho" without using "a lot" could I say " I have worked a great deal" or I just can say " I have had a great deal of work"?
By the way could anybody suggest me something more.

Thanks in advance.

 

[Sairen]

Either of those is perfectly fine, and sounds very natural.

 

[Why?Why?Why?]

Thank you Sairen!