Every must$-$move TM is equivalent to a basic TM$.$ Why?

Choice $1$ of $2$:A must$-$move TM can be seen as a basic TM that happens not to have any transition that uses the "stay" option.

Choice $2$ of $2$:Given a basic TM$,$ we can convert it into a must$-$move TM by replacing every stay$-$transition by two transitions, a transition that moves left followed by a transition that moves right. The left$-$move transition writes what the stay$-$transition does, and the right$-$move transition ends up in the same target state as the stay$-$transition.