Future Simple + Present Simple
Incorrect : I shall see you when I shall come back.
Correct : I shall see you when I come back.
Incorrect : He will take a bath before he will take his lunch.
Correct : He will take a bath before he takes his lunch.
Incorrect : She will talk with you after she will finish her dinner.
Correct : She will talk with you after she finishes her dinner.
Note : When we refer to two future actions, we use the future tense in the principal clause and the present simple tense in the subordinate time clause.
