I'm not sure if this is what you're looking for, but I think you're missing the verb "dijeron" after me and before que.
If julio verne ubiera used units whether which title would have given his book 20000 leagues under the sea express using whole numbers using the unit of if more large
It is wrong... It should say "Cuando nos fuimos de vacaciones todo salió mal."
Es necesario conservar el suelo para proteger el medio ambiente
