After summer comes autumn.

秋天在夏天之后。

Autumn comes after summer.

秋季在夏季之后。

Fall is after summer.

秋天就在夏天之后。

My son is going to college after summer.

夏天过后我儿子就要上大学了。

Fall comes after summer. It is the harvest season.

夏去秋来，秋天是收获的季节。