What is Their Main Difference?
Future simple tense tends to appear when we are talking about decisions that we made, while future perfect tense guesses the time of the completion of events.
Uses and Comparison
1. Making Decisions
When we want to talk about decisions that we make for the future, we use the future simple tense.
Here, we are talking about a decision in the future.
won't have helped her.
Here, we are talking about having regrets and not making decisions.
He we are talking about a premade plan.
will have visited our parents.
Here, we are not talking about a decision.
2. Future Events
Both tenses tend to describe future actions but they express different actions and events.
3. Completion of Actions
We use future perfect tense to talk about forecasts of actions or events. We tend to guess the time of the completion of events and actions.
By next Thursday, I
Here, we are talking about the completion of events.
By next Thursday, I
will finish my homework.
Here, we are talking about future plans.
Here, we are talking about the completion of an event.
will graduate by next year.
Here, we are talking a certain future action and not the completion of an event.
4. Order of Events
The future perfect tense can be used as a comparative tense. This means that we use this tense to compare events and actions to predict which one will end sooner.
Here we are talking about the order of events.
will arrive by the time she finishes.
Here we are not talking about order of events but rather naming them.
Here we are talking about order of events and guessing which will end sooner.
will have eaten by the time he gets home.
Here, we are naming events.
Now that we tackled the uses and comparison, we will talk about the structure of the two verb tenses.
1. Future Simple Tense
In order to create this tense, we tend to add 'will' to the subject at the beginning of the sentence, then the base form of the main verb. Have a look:
2. Future Perfect Tense
The future perfect tense tends to follow a certain pattern:
Subject + will + have + past participle
In this pattern, we have the auxiliary verbs 'will,' or 'have' followed by the past participle of the main verb.