The grammar presented is based on the grammar of written and spoken English as it is used in college lectures, textbooks, academic essays, high school classrooms, and coversations between instructors ...

Sometimes you can use either the future perfect or the future perfect continuous. We use the future perfect continuous when we want to emphasise the continuous nature of an action. In June I’ll ...

However, this sounds quite formal and in spoken English we would normally keep subject words and auxiliary verbs.