She will visit her grandmother tomorrow

She visiting her grandmother tomorrow

She visited her grandmother yesterday

Answer

“She will visit her grandmother tomorrow.”

Explanation: The simple future tense is used to describe an action that will happen at a later time. In sentence A, “will” is used to indicate that the action (visiting her grandmother) will occur in the future. The structure of the simple future tense is “will + base verb”(in this case, “will visit”).