Sentence examples for been difficult to prettify from inspiring English sources

been difficult to do

been difficult to obtain

been difficult to separate

been difficult to link

been difficult to place

been difficult to come

been difficult to interpret

been difficult to correlate

been difficult to tackle

been difficult to implement

been difficult to distinguish

been difficult to investigate

been difficult to draw

been difficult to validate

been difficult to address

been difficult to resolve

been difficult to pin

been difficult to treat

been difficult to attain

been difficult to design