in my opinion.

For my money, the northwest of Scotland is the most beautiful part of Britain.

• can't make head nor tail of something
• can't make head or tail of
• can't make head or tail of something
• can't put a foot wrong
• can't see beyond the end of nose
• can't see beyond the end of your nose
• can't see past the end of nose
• can't see past the end of your nose
• can't see the wood for the trees
• can't stand the pace
• can't take eyes off
• can't take eyes off someone
• can't take eyes off something
• can't take the pace
• can't take your eyes off
• can't take your eyes off someone
• can't take your eyes off something
• can't tell arse from elbow
• can't tell arse from your elbow
• can't tell your arse from elbow
• can't tell your arse from your elbow
• can't think straight
• can't to save life
• can't to save your life
• cap it all