The phrase "attentively when" is correct and usable in written English.
It can be used to describe the manner in which someone is paying attention to something at a specific time or event.
Example: "She listened attentively when the teacher explained the complex topic."
Alternatives: "carefully when" or "mindfully when".
They listen attentively when another person is voicing a point of view.
He was a little nervous as he carefully studied a deep blue compact model, and watched attentively when the salesman demonstrated how to check the dipstick.
Smith brings out beautifully Madeleine's waspish irony, emotional withdrawal and permanent sense of having settled for less: she evenlistens attentively when the other character is speaking.
Most recognize the issues (often attentively when at crisis levels) and others are slower to elevate them in public dialogue.
Cadres said that the Hebei Communist Party secretary didn't pay enough attention to poor people and that their provincial governor wasn't patient and didn't listen attentively when they delivered their work reports.
Listen to her attentively when she talks.
"Ross listened attentively, and when Ron was done, Ross said, 'The force is with the young man,' " Mr. Trbovich said.
The ramp's geometry feels bizarre, but lots of things might when attentively beheld.
It is difficult to believe any Cheltenham Town player will be listening as attentively as Jerry Gill when John Ward announces his line-up for tomorrow's League Two play-off final against Grimsby Town.
Listen attentively to people when they talk.
The preschoolers performed these feats by carefully noting just what the machine does and when, by attentively watching what adults do to it and what happens as a result, and by playing with the machine themselves.
