French phrase
Je peux en faire beaucoup.
Meaning
I can do a lot of them.
When to use it
Says that many instances of a prior action are possible. The referent is supplied by context.
Example dialogue
Tu peux faire combien de sauts à la corde ?
How many jumps can you do with a jump rope?
Je peux en faire beaucoup.
I can do a lot of them.