According to Oxfords, the primary source(s) of words in the English language are as follows:
...the result of a computerized survey of roughly 80,000 words in the old Shorter Oxford Dictionary (3rd edition) was published in Ordered Profusion by Thomas Finkenstaedt and Dieter Wolff (1973). They reckoned the proportions as follows:
* Latin, including modern scientific and technical Latin: 28.24%
* French, including Old French and early Anglo-French: 28.3%
* Old and Middle English, Old Norse, and Dutch: 25%
* Greek: 5.32%
* No etymology given: 4.03%
* Derived from proper names: 3.28%
* All other languages contributed less than 1%
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IMO comparred to French or Spanish, English is a very "crude" language. But we're stuck with it as the lingua franca of our era.
As for ease of learning, Spanish is FAR easier to learn than English. If the UN were to take a vote on which language should be adopted as the global lingua franca, or "2nd language for everyone", I'd cast my vote for Spanish.