Can I Put Acrylic Nails Over A Half Grown Fingernail?

I wouldn't because your nails need to breath to grow.,

I did this once and regretted it.  The acrylic adheres to the skin if the nail is not completely there and it is very painful when you finally take it off.  This did not happen to me, but there is also a risk of infection.  My advice is don't do it!

I had a friend that did that and she got a terrible fungus infection, better to be on the safe side and get that nail grown out before you put a fake one on, it's too easy to get water trapped under the acrylic, and that's when you get in trouble.  Been there, done that, although I put a fake one on my big toe after I took the nail off with a vacuum cleaner, really, and it was a Big Mistake!