Most curricula will have an organization of verb tenses toward the end of the book, which includes all the variations of past, present, and future including perfect, progressive, and simple. These foundational tenses make up the bulk of English and can be very confusing, if they are not centrally located. Feel free to use the following breakdown for the English verb tenses.
Simple Present - I eat pizza every day.
Simple Past - I ate pizza yesterday.
Simple Future - I will eat pizza tomorrow.
Present Continuous - I am eating pizza right now.
Past Continuous - I was eating pizza yesterday during the meeting.
Future Continuous - I will be eating pizza all day tomorrow.
Present Perfect - I have eaten pizza my whole life.
Past Perfect - I had eaten a pizza before you came.
Future Perfect - I will have eaten a pizza by the time you show up.
Present Perfect Continuous - I have been eating pizza since 2 this morning.
Past Perfect Continuous - I had been eating pizza until she stopped by with ice cream.
Future Perfect Continuous - I will have been eating pizza for an entire hour, before you arrive.