Hi CindyCherry2022,
Welcome to the Apple Community :-)
Re: "cannot import photos from my iphone to my Macbook"
Wondering which method you are using that isn't working for you.
Eg: Import to Photos app:
Transfer photos and videos from your iPhone, iPad, or iPod touch to your Mac or PC - Apple Support
Eg: Image capture
Transfer images in Image Capture on Mac – Apple Support
Eg: Sync using the Finder
Use the Finder to sync your iPhone, iPad, or iPod with your computer - Apple Support
Eg: Airdrop
How to use AirDrop on your iPhone or iPad - Apple Support
& Etc...
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Re: "unrecognizable file format" .... "What Should I do to import those photos?"
Seems your iPhone may be capturing photos in the newer, space-saving HEIC format, and / or "live" (animated) photos,
and
your Mac may be used to importing in the older .jpeg (or. jpg) format.
If this is what's happening:
You. might want to browse through Apple Support's articles for a choice of ways how to "harmonise" things
Using HEIF or HEVC media on Apple devices - Apple Support
eg: you might want to change settings so iPhone uses the older jpeg format so all photos are compatible with the Mac
or
(if not already ... maybe updating sMacOS oftware to one of the more recent versions may solve the issue.
All the best :-)