make believe
To pretend or imagine.
Let's make believe that we are explorers.
ADV
firmly, really, seriously
sincerely
I sincerely believe that you will do well in your exam if you study hard.
mistakenly
VERB + BELIEVE
can't/cannot, could not
She couldn't believe how much her old house was worth after the renovations.
be hard to
It was hard to believe how quickly the children grew up.
give sb to
His letter gave us to believe that he would arrive next week.
have reason to
Police have reason to believe the missing child is somewhere in the local area.
be inclined to
She was inclined to believe the weather forecast after it had been accurate all week.
lead sb to
The teacher's comments led me to believe that I was making good progress in math.
PHRASES
can/could hardly/scarcely believe sth, not believe a word of sth
She couldn't believe a word of his excuse about missing the meeting.