The thing is that it isn't your language, even if you're native English. (I'm not, I'm Hungarian, which is a 100% weird language not too similar to any other.)

The thing is that it isn't your language, even if you're native English. (I'm not, I'm Hungarian, which is a 100% weird language not too similar to any other.) Most programming languages, especially the ones used for introduction, use a very limited vocabulary. This e.g. pretty much looks like python, I'm sure it has no more that 40 keywords. Most of your programs will not be keywords, i.e. symbols from the programming language, but the identifiers you define. Now you could use your native Spanish (or Russian or Hungarian, etc.) for those, but even that is not very useful. When you think about the program, you think with the constructs of the language (and also, as you get better, with the patterns you have learned). Then you express those thoughts with the language and the constructs you have created. The only place I can imagine this making sense is a scratch-like block language. But I'd say that even then it just hinders learning and development. Sooner or later you'll have to switch and the later you do the harder it will be. Also, this can be a great motivation to actually learn English. For me, at least, it was.