"needed mostly" is a grammatically correct phrase and can be used in written English.
It means that something is required or essential for the majority of the time. Example: "In order to make her dream come true, she needed mostly determination and perseverance."
She worked away from her extensive costume racks and prop stashes this time, so her subjects needed mostly to style themselves.
Previously, photographers had to carry equipment both cumbersome and easily destroyed by the heat and sandstorms prevalent in the region, and because of the long exposure times needed, mostly made images of static scenes: landscapes, archeological dig sites, and monuments.
There was a recorDuringaying theseumber had been disconnectimes
According to NPR, contrary to popular belief summer vacation does not have its roots in farming culture, because children of farmers would have been needed mostly in the springtime when crops were planted and in the fall when crops were harvested.
Relatives needed mostly information about the location of patients, departments or other facilities.
Time extension is needed mostly to support effective implementation of the Law on Social Welfare and Child Protection as well as to achieve other project objectives.
It has so far raised $45m of the $65m it needs, mostly from a handful of large donations.
Yet most Americans consume more than double the amount they need, mostly from processed foods, so it is best to limit salt - of any kind.
Nick Bryer The crucial point at financing the SDGs is that we need mostly grants and can't deal with loans or any forms of private risk capital, because the monetary return is mostly very limited.
You need mostly solar, a lot of wind.
The protection of health, safety and the environment needs mostly to be enhanced by improving implementation of current legislation'.
