Translate grammar sentences

One of the low-fun activities for me is the translation of sentences from L1 to L2. Some exams still have this tasks and some students still choose exams that have it.  Of course they are beneficial though. Khmmmm...
Suppose your students are to translate a couple of sentences that are examples of a certain grammar points.  You can post these on Facebook, you can assign two or three sentences to one student. After having translated them peers can correct or comment on each other's sentences.
Variation:

They will use Google Translate, it will give them sentences with errors. Why don't they correct them?

You can also give them google-translated sentences with errors, they would have to correct them and find out the original L1 sentence.