However, is not a recognizable standard English topic. It could be:

: At the photo session stop, students must correct sentences using the present continuous tense (e.g., "The children are smiling at the camera" ) to successfully snap and unlock the group picture.

" and other Unit 7 topics can be found on Talk n Walk and Info Mirror .

Which of these did you mean, or should I search the web for the exact phrase and return precise details?