Question in general grammar

Question

i find it difficult to use either the simple future or future perfect with the expression by sometimes i find this expression goes toghether with both tenses. help me please understand the difference in use. thank u in advance

AlpheccaStars · Accepted Answer

Future perfect always has a reference point in time in the future, and a prediction of some event happening. That event will be completed at or before (by) that time.
In this tense, the mood is looking back from a future point. People do not commonly use this tense.
The simple future is just looking forward in time from the present. It is much more common. Here is an example:

Car salesman:

We are having a big sale at the car lot. My manager predicts that by the end of the month we will have sold more than twenty new vehicles and thirty used vehicles. (The manager imagines that he is in his office at the end of the month and looking at the monthly sales reports.)

We are having a big sale at the car lot. We are offering low prices, free upgrades, and low interest rates on financing. My manager predicts that we will sell more than twenty new vehicles and thirty used vehicles by the end of the month. (The manager is just making a future prediction from the present time.)

The simple present can also give the sense of future time:

The manager told us yesterday that if we do not sell more than twenty new vehicles by the end of the month, he will have to lay three salesmen off.

The manager told us yesterday that if we sell more than twenty new vehicles by the end of the month, he will give us all a bonus.

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