The phrase "a main task" is correct and usable in written English.
It can be used to refer to a primary or significant task within a larger set of responsibilities or activities.
Example: "In our project, a main task is to conduct thorough research before moving on to the implementation phase."
Alternatives: "a primary task" or "a key task".
Oct. 9 & 15 had as a main task to convince Arabs & Israelis that Amer.
In a state of Continuous Partial Attention, a user focuses on a main task while monitoring secondary tasks, in case something better comes up.
A main task has been to convince Minnesotans that he is one of them—he grew up there, but spent much of his adult life in New York.
BERLIN — In the final hours of her campaign for re-election, Chancellor Angela Merkel proclaimed that anchoring worldwide the principles of the German economic and social model would be a main task of a new government in Berlin.
A main task for her is stroking egos and telling executives that it is all right to accept a lower-level position until the job market opens up, she said.
Identifying DNA splice sites is a main task of gene hunting.
A second main task is to paint a plausible and coherent picture of morality that avoids luck.
Sonification, the presentation of data as (non-speech) sound, has proven in several studies that it can help in guiding the user's attention, especially in scenarios where process monitoring is performed in parallel with a different, main task.
He had an affection for the revolutionary Che Guevara, whose photo was on his cellphone, a somewhat jarring affinity for a general whose main task these days is thwarting a rebellion.
In this role as a scientific collaborator or a chief economist of an administration, the main task is to point out economic costs and benefits and if necessary propose alternatives.
All of this may be seen as long-term projects that cannot be accomplished by the interim government headed by President Boniface Alexandre and Prime Minister Gérard Latortue, a technocrat whose main task is to organize general elections in two years.
