The phrase "attend closely" is correct and usable in written English.
It can be used when instructing someone to pay careful attention to something, such as a presentation or a set of instructions.
Example: "During the lecture, I encourage you to attend closely to the speaker's main points to fully grasp the material."
Alternatives: "pay close attention" or "focus intently".
Reagan does attend closely to his relationship with his audience.
Finally, in whatever version of the salad, you will want to attend closely to the texture of the dressing.
Interested in the minutest of effects, Valenciennes also recommended that painters study rushing water to understand movement, and attend closely to expressive tree trunks and their gnarled barks.
But it would have required the patience of a saint to attend closely to the droning, meandering and pointless dreariness of the tale she then told about her two sons.
I was most impressed by Marcus' characteristically democratic assumption that Presley and Melville were cultural and political equals, and were, therefore, already in conversation with one another — having a dialogue about freedom and limits, innovation and tradition, American dreams and American obsessions, if only we would attend closely enough to catch what they were saying.
But, when asking questions about total evidence one must attend closely to the base rate, which almost always provides evidentially relevant information about the hypothesis.
The Indians' strategy, diplomacy and unorthodox military tactics are the chief focus of this program, which attends closely to their considerable role in the war.
His eventual achievement of belonging in this strange new place, his arrival in full, depends upon attending closely to the details of fellow newcomers' stories, customs and advice.
Though crinkly, the costumes work fine, and Mr. Millepied's dance for three couples attends closely to its score, "Drones and Viola," by his frequent collaborator Nico Muhly.
As a self-aware show, perhaps too self-aware, "Nashville" attends closely to the money-country nexus, mindful that it's not your daddy's, nor Robert Altman's, "Nashville".
For another, he couldn't help attending closely to language, and the language he encountered from the many experts and medical textbooks he consulted disturbed and often angered him.
