Help to solve gerund clause examples

Hello, and thank you for your question. This can be quite a tricky one.
A gerund clause is a group of words that start with a gerund. A gerund is a verb form that ends in 'ing' and functions as a noun.
The example that you give already has a gerund in it, namely 'studying', but we could rewrite it to form an extra gerund as follows:
'Watching a movie was what she did after the she finished studying'
Now you have both 'watching' and 'studying' as gerunds. 

I hope that this is of some assistance.