Grammar – Differences Between ‘It Gonna Be’ and ‘It Is Gonna Be’

Both are correct. The first (with "through") suggests that the school year ends at the end of June, whereas the second s(with "to") suggests that the school year ends sometime during the month of June.

However, in casual speech, the first might be understood the same as the second. To be perfectly understood, specify the day of the month:

• Julie went to school from September 4 {to/through} June 12.

In that case, "to " and "through" might both be understood as meaning that June 12 was the last day of school.

The present perfect describes something that happened at an uspecified time and when the exact moment of occurrence isn't important.

Although this usually means "an uspecified time before the present", the present perfect is also used in subordinate clauses to talk about an uspecified time in the future (when the main verb is in the present or future tense.)

This usage of the present perfect often follows these words and expressions:

• when
• until
• once
• if
• after
• before
• as soon as
• ...and others

I'll go shopping when the rain has stopped.
After the rain has stopped, I mow the lawn
I'll go shopping once the rain has stopped.
I'll go shopping if the rain has stopped.
Until the rain has stopped, I won't go shopping.
I make nachos before the game has started.
I'll stop playing as soon as this quarter has ended.

Note that we can also (and more frequently do) use the present simple to describe the future in these subordinate clauses with no change in meaning.

I'll go shopping when the rain stops.
After the rain stops, I mow the lawn.
I'll go shopping once the rain stops.
I'll go shopping if the rain stops.
Until the rain stops, I won't go shopping .
I make nachos before the game starts.
I'll stop playing as soon as this quarter ends.