Expression en anglais ! n°1

Question 1

to bark up the wrong tree

Answer 1

to be wrong about the reason for something or the way to achieve something:
She thinks it’ll solve the problem, but I think she’s barking up the wrong tree.

Question 2

to be on the tip of your tongue

Answer 2

If something that you want to say is on the tip of your tongue, you think you know it and that you will be able to remember it very soon: