# TeXStudio doesn't recognize some commands

I'm starting to use TeXStudio. I'm having some issues, for example with

\begin{align*}
\sqrt[n]{a}^2-\sqrt[n]{ab}&=m\sqrt[n]{a}\\
\end{align*}

When i put the point on align* i get a small message unrecognized command, when it is in \sqrt or ^ i get the message math command outside math env, and something similar happens with & when it gives me the message tabular command outside tabular env. These commands are highlighted with an orange background.
I have similar mistakes with \eqref,\implies. Some commands as \title,\author or \sqrt(when it is between dollar signs) don't present any problem.

When i build the PDF, i have no problems at all and it gives me the desired result.
I'd like that TeXStudio recognize these commands

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