Verb conjugation of "decode" in English

On Thursday I have an appointment. If there is no other way, I'll move it. Can you meet on Tuesday, April 11, anyway? I suggest 10.30 in the morning, but I'm fairly flexible, so noon is good too.
On the frozen lake, you can skate, but I would never dare it because it is far too dangerous. Who knows how thick the ice really is and how accurate the measurements are. It can break.
My Spanish is weak, and I need to improve it here. But it is very difficult because I have many other things to do. I must take care of my family and my friends and have no time for Spanish.