Looking on the internet deeply has found these results:

she must be busy is the most popular phrase on the web.

she must be keeping busy 11 results on the web	she must be busy 11,050 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Sep 1, 2012 ... She must be keeping busy, not active here in awhile, but that's neat all the same. "If God dropped acid, would he see people?" Steven Wright.	She must be busy in some work. No friend in this word ever forgets the other.. Its just mere situations comes between them. Respect each other and don't ... Dec 16, 2014 ... Hmm. She must be busy. It wasn't until I got home and was scrolling through Facebook that I saw it: A picture of Kim and two of her girlfriends in ... She might be checking her schedule to be with you, come on give her some time. She must be busy with something. Don't create a why and if of it. Embed Quote. May 18, 2014 ... Don't phone Ann now; she would be busy. Don't phone Ann now; she must be busy. (I ignore periphrastic modals like hafta, gotta, oughta, etc.

she must be keeping busy

11 results on the web

she must be busy

11,050 results on the web

More popular!

Sep 1, 2012 ... She must be keeping busy, not active here in awhile, but that's neat all the same. "If God dropped acid, would he see people?"
Steven Wright.

She must be busy in some work. No friend in this word ever forgets the other.. Its just mere situations comes between them. Respect each other and don't ...
Dec 16, 2014 ... Hmm. She must be busy. It wasn't until I got home and was scrolling through Facebook that I saw it: A picture of Kim and two of her girlfriends in ...
She might be checking her schedule to be with you, come on give her some time. She must be busy with something. Don't create a why and if of it. Embed Quote.
May 18, 2014 ... Don't phone Ann now; she would be busy. Don't phone Ann now; she must be busy. (I ignore periphrastic modals like hafta, gotta, oughta, etc.