When a learner hands in an assignment, or performing a demonstration or delivering a presentation, remember that he or she is giving you a piece of himself. Be kind with your comments. Say something positive first; point out paragraphs that need improvement next, and end with something positive.
Example:
Xoli, (always address the learner):
"It was very clever to introduce your presentation with such provocative, rhetorical questions. You certainly gain your audience’s attention. However, you tended to lose your focus at times in the body of the presentation by introducing points that are irrelevant to your topic. For example, remember you promised to convince me that… Also, please pay attention to… Overall, this was a good effort as a presentation, but in future you can do the following to improve…"