6th Grade Grammar Tenses
The present tense can be divided into: 1) Present simple, 2) Present continuous, 3) Present perfect and 4) Present perfect continuous. The present simple is basically used for three types of actions.
Grade 6 Grammar Lesson 2 The present perfect and the present perfect continuous
Grade 9 Grammar Lesson 24 Must and have to
Grade 8 Grammar Lesson 10 The past perfect tense
Grade 8 Grammar Lesson 7 The present perfect continuous tense
Grade 10 Grammar Lesson 29 Article with plural and uncountable nouns
3rd Grade Grammar Comparison of Adjectives