Yes, you can still ask questions, but you have to be careful.....if your next few questions are not well-received, you will be placed on a posting ban and you won't get to post questions for 6 months (as far as I know). If your next post after the 6 month ban isn't well received either, your ban will be reinstated. Trust me, I've had that warning over on StackOverflow. In order to avoid this warning, edit those badly-received questions you have (those with a score of 0 or less) to where they are higher-quality. Make sure that you have added any clarifications needed to your questions and use MathJax to format your equations if need be. Good questions will result in upvotes, which lead to good answers. So, just be careful on the quality of your next posts if you are ever under that warning.