The phrase "supplementary activity" is correct and can be used in written English.
It refers to an additional or extra task or action that supports or complements the main activity or task. Example: As part of their language learning program, students are encouraged to participate in supplementary activities such as language exchange programs or cultural immersion experiences.
Fishing is a supplementary activity.
"So I will now concentrate mainly on learning Hebrew and writing my memoir of philo-Semitism unchosen, with supplementary activity based around lunching, lazing and loafing.
As a supplementary activity, tourism can be a less risky addition.
This makes vegetable gardening an ideal supplementary activity where adequate water is available.
We know, along with the nutritional supplementary activity, AvG have strong antioxidant properties (Botes et al. 2008; Amoo et al. 20122013).
This implies that students may benefit from starting with tutored worked examples integrated as a supplementary activity, before they are integrated into a problem-solving impasse, to help students become familiar with a dialog-based pedagogical approach.
"I think school districts historically and clearly have the right to make accommodations for parents who want supplementary activities, and districts have to decide whether those activities conflict with the curricular goals of the school," he said.
They installed and ran the software and participated in a wide complement of supplementary activities.
O'Flaherty and Philips (2015), whose research focused on student-centred learning perspectives, gathered that the flipped classroom is superior to traditional methods of learning and teaching, in which lectures are delivered during class and students are asked to engage in supplementary activities outside of class as homework.
The inescapable self-help sticky notes on the walls, the dictatorial dietary options, the pointedly yuppie supplementary activities, and the 'what you want, when you want it' consumerist nature of clubbing in the morning.
Most countries use a combination of routine services and supplementary activities.
