be/live in a dream world

to have ideas or hopes which are not practical and are not likely to be successful.

If she thinks he's suddenly going to turn into the perfect boyfriend, she's living in a dream world. (usually in continuous tenses)

• could do with one hand tied behind back
• could do with one hand tied behind their back
• could do with something
• could hear a pin drop
• could in sleep
• could in their sleep
• couldn't [act/argue/fight] way out of a paper bag
• couldn't [act/argue/fight] your way out of a paper bag
• couldn't act way out of a paper bag
• couldn't act your way out of a paper bag
• couldn't argue way out of a paper bag
• couldn't argue your way out of a paper bag
• couldn't believe eyes
• couldn't believe your eyes
• couldn't care less
• couldn't fight way out of a paper bag
• couldn't fight your way out of a paper bag
• couldn't have asked for anything more
• couldn't have asked for more
• couldn't lie straight in bed
• couldn't organize a piss-up in a brewery
• couldn't ... way out of a paper bag
• couldn't ... your way out of a paper bag
• could standing on head
• could standing on your head