Here are two sites that not only practise what they preach, they allow you to test your own skills to see our they compare with those of industry leaders.
For French, take a look at Dominique Jonkers' Facebook page entitled Des pépites sur le bout de la langue. Here is what Dominique has to say about the omnipresence of « permettre de + infinitif » in French. To test your own skills stop reading after you've copied and pasted the challenge into, say, a Word document. Work on the challenge yourself, then compare you best effort to Dominique's.
In English, go to Writing.Rocks and try your hand at Marcia Riefer Johnston's latest Tighten This! [writing/editing game], currently at Challenge sentence #19.
Challenge sentence #18 was:
My entry read:
All MegaCorp contracts to acquire goods and services for government contracts are subject to contractual, regulatory and statutory requirements.The winning entry read:
When acquiring goods and services to execute government contracts, MegaCorp must obey applicable contracts, statutes, and regulations.