Describe the use of 'when' and 'whenever' with the simple future tense.

When and whenever are both used to introduce adverbial clauses of time in the simple future tense. These clauses provide information about the timing or occurrence of an action or event in relation to the main clause.

1. When:
When is used to introduce adverbial clauses that indicate a specific point in time or a particular condition that must be met for the action in the main clause to take place. It is often used with the simple future tense to express future actions that are certain to happen.

Example 1:
I will call you when I arrive home.
In this sentence, the adverbial clause "when I arrive home" indicates the specific point in time when the action of calling will take place. It suggests that the speaker will definitely call once they reach home.

Example 2:
She will start studying when she finishes her dinner.
Here, the adverbial clause "when she finishes her dinner" indicates the condition that needs to be fulfilled for the action of starting studying to occur. It implies that the person will begin studying only after completing their dinner.

2. Whenever:
Whenever is used to introduce adverbial clauses that express repeated or habitual actions in the future. It suggests that the action in the main clause will occur every time the condition mentioned in the adverbial clause is met.

Example 1:
Whenever it rains, I will stay indoors.
In this sentence, the adverbial clause "whenever it rains" indicates the condition that triggers the action of staying indoors. It implies that every time it rains, the speaker will always choose to stay inside.

Example 2:
He will always help you whenever you need assistance.
Here, the adverbial clause "whenever you need assistance" suggests that the person will consistently offer help every time the need arises.

In summary, both 'when' and 'whenever' are used with the simple future tense to provide information about the timing or occurrence of an action. 'When' is used for specific points in time or conditions, while 'whenever' is used for repeated or habitual actions in the future.