Concentrating on one language: Does it cause a deterioration in the others.
In my case it certainly does. I speak a reasonable level of Spanish but have studied German, Portuguese and Italian just to be able to speak the basics when travelling. Now I am determined to properly learn French but find that my level of Spanish is dropping and I am mixing up words.
It doesn't matter if I mix up words occasionally because I can still communicate but I don't want the level to drop further.
Any tips on how to keep both progressing at the same time. I have considered having a French day and then a Spanish day but don't know yet if that will work.
I've tried learning multiple languages at once and in my case it was sort of the same way, and I've found that for me at least, it's better to just focus on one language until I have a good enough handle on it that there's no way I could mix it up with a different language. I'm so impatient to learn Swedish, but I'm forcing myself to wait and at least finish my French tree. I think once you master a language well enough that you can read an article in the language and have a pretty good understanding of what you're reading, even if you can't understand every word, then you know the language well enough that you won't have much problem picking up another language. I do try to do some French every day, and that hopefully won't change once I start learning Swedish, but the more languages you pick up, the more time you're going to need to devote to each language so that you don't lose what you've learned and you can continue to progress. I like your idea of having one day for each language, and it might be worth trying.
I speak and learn so many langauges that I actually started to forget my native language. xD I mix all words, grammar and I sound very weird. For example: when I speak in my native, I forget words and keep silent trying to remember the word, my head "shows" me words in other languages, but I cannot remember my native language's word. xD It was very bad "trait" at college when I had to do presentations.... I got lower marks because of "innapropriate language"... I do not know solution to this "brain condition", but I see I'm not the only one with "mixed" head.
It is nothing wrong with you head ! I forget how to write in my first langugage because i do not use it at all in purpose to learn properly my second one.
So I'm not the only one here so "mixed". :D I do not use a lot of my native language. Just in shops, all institutions and with family. But mostly I use English to write and chat with my friends.
well I've heard that people say that learning similar languages will confuse you more, but I haven't been confused between Spanish and Portuguese at all (maybe using some Spanish words when translating to Portuguese rarely, but not more than that)
Use DuoLingo to learn French.
Practice your Spanish by watching Velvet on Netflix. It's in Spanish and you can switch between Spanish and English subtitles as needed. Maybe to start watch an episode in English, and then rewatch it in Spanish.
The thing is that if you don't know something good, the brain starts to list everything that can match the request, so you start mixing stuff. For example when I think of 10 in French, my first thought may be "ten" instead of "dix", because I'm used to English more.
You can practice more than one language, BUT you have to do it as if they were independent, thus each language gets its own practice so their words can connect properly.
I personally find it too hard and inefficient to learn more than one language at the same time, my advise is to take it slow, even if your Spanish level drops, it's not like you will have amnesia and suddenly forget every little Spanish you know lol...
Besides it's way better to know one language very well rather than knowing 10 languages very poorly. Trying to learn more languages at the same time is no different than trying to walk on multiple paths = drunkard!
Actually you can forget every little Spanish you know if you do not practice it contstantly. Knowing one language, even pourly, sometimes can help you learn other one if they have something in common, as spanish and french are.
I think this fits how I feel best, I want to learn French and am doing okay but it has had the cost of my Spanish worsening through lack of practice. I do read Spanish websites and watch occasional Spanish TV programmes and you tube videos. I changed my you tube language to Spanish and my location to Colombia which provides me with good content. I think the answer can only be hard work and constant practice of both languages.