FANBOYS

For:
I took her classes for her while she was sick.
And:
Miss another class and you will fail.
Nor:
She doesn’t like them and nor does Jeff.
But:
His mother won’t be there, but his mother might.
Or:
My mom will go to market or office.
Yet:
As yet little was known of the causes of the disease.
So:
She worked hard so that everything would be ready in time.